We have a spa connected to our pool. This one only gets hot if we turn it on. It doesn’t get used much as the pool isn’t used as much now that the kids are gone. We have a cover for the pool that keeps it clean. H is our pool man and he spends about 30 minutes a week cleaning the pool. We do have an automatic chlorinator and a pool sweep so the pool stays pretty clean.
We also have a stand along hot tub on the deck outside our master bedroom. It sits on top of the deck. My H uses it every evening. He has an ocean view from the deck and it is his unwind time at the end of the day. It has a cover and he doesn’t find it to be a lot of work or maintenance. The biggest problem is he plays beach volleyball and even though he swims after he always seems to have sand left on him. It is really hard to get all the sand out of the bottom of the hot tub. I rarely go in it. I prefer my bath tub. He has never had any health issues using his spa but he is the only one who goes in it.
Our good friends, who are also neighbors, have one on their deck and they invite me over all the time to sip wine and chat under the stars. DH hates tubbing so never comes. I especially like going in the dead of winter. My friends have special bathrobes and towels for tub guests.
I’d never put one in at my house - because that is what friends are for. 
My other good friends, who are also neighbors, have a pool which I can use anytime I want.
I get all the benefits with none of the hassle or expense. 
My FIL had a fancy hot tub delivered and installed into their very tiered back yard. It was effectively down two+ stories from the driveway. They loved it, but when they could no longer use it, after checking with removal services, he hired some guys to cut it up with a chain saw and rented a dumpster for the debris!
We have an above ground Jacuzzi that is separate from our pool. It is 6 years old. The maintenance on the Jacuzzi is minimal, and I do it myself. (We pay someone to maintain the pool.) It is just outside our bedroom, and we use it most nights before bed.
I put bromine tablets in weekly and usually have to put in a bit of pH+ chemical based on the test strips. It just recently needed a new filter pump (first time in 6 years), but is not nearly as expensive to service as the pool. It has UV bulbs in the filtration system that are supposed to also kill bacteria along with the bromine. The bulbs go out every year or two, and there is an error code that tells you when that happens.
We had a previous hot tub that came with the house and got too expensive to repair. This one uses a lot less electricity, and we have solar panels. It was not difficult to have the old one removed. I think they did use a saws-all to cut it up.
If we got a new house, we would want one without a pool, but would add a hot tub if it didn’t already have one.
The hardest part of maintaining the hot tub at my cabin is digging through 6 feet of snow to get to the hot tub and then clearing the cover. Without big snow storms it is about 3 minutes of work every few times we use it.
We have a hot tub that we enjoy quite a bit. We like to sip wine and watch the eagles soaring over the water. It has been broken lately, though, and my husband insists on trying to fix it. He usually manages to fix it himself. Was quite a feat to put in. They said the only way to do it was by boat or helicopter. We transported it with our small boat, and it pushed the boat down so low it almost got stuck in the lake! Sometimes doing everything yourself can be a big mistake… 
Should have towed it? :))
Funny, TiggerDad, we should have rented a small barge, as it is almost a thousand pounds. I told my husband that if the boat started going down, just grab a life preserver and jump off it! The delivery guy who helped us said it was one of the most challenging deliveries ever…and he didn’t even do the water transport part.
Holy cow, bus! That is the craziest DIY story I have ever heard! My hat is off to you two. Especially for still staying married to each other.
NTM or “hot tub lung” is a risk of hot tubs and other aerosolized water. You can search it. I’m a germophobe and we all already have lung conditions so our family is NOT interested. I have 2 sibs who have hot tubs. One has never used it. The other does from time to time to allow toddlers to bather when they swim in her pool.
Our neighbor who has an adult offspring with MS or MD does have a hot tub their S uses to keep his muscles somewhat conditioned/exercised. He’s confined to a wheelchair.
We had one for a while -it broke down all the time. I think we had a lemon. Or some kind of electrical problem.
Also I couldn’t manage the cover very well.
If you get one I would practice with the cover at the store and also I would ask about their repair service. Our place went out of business after we bought ours and we couldn’t find anyone else in our area that worked on that brand.
It was not off brand either -it was Hot Springs
Regarding aerosolized water, we always use ours without the air jets. Just soaking in hot water. It’s actually not because of the aerosolized water, but because we like it quiet.
Funny, it was too stressful for screaming. My husband had built a ramp that bypassed the stairs from the dock so we could ferry it, and it started leaning towards the water…we were going to stop, and the delivery guy yelled, “Just go!” Another chance to end up in the lake. I swear, we always do things the hard way. But the DIY stories of my dad are much worse, so I feel lucky. 
I rarely get into a hot tub, public or private because of the following reasons. Some are exaggerated but still…
https://www.huffingtonpost.com/2014/05/19/hot-tub-germs_n_5268919.html
https://www.buzzfeed.com/carolinekee/hot-tubs-more-like-not-tubs?utm_term=.idkmzyxNG#.biQ9D0Ppr
^^Killjoy 
Are hot tubs that are part of a swimming pool’s filtration and chemical treatment a risk? Our set up is not nearly as grand as what @Nrdsb4 described, but similar. When you want to use the spa, you turn on the heater and change the valves so that water is only circulating in the spa. About 15 minutes later it’s hot. When you are finished you reverse the process and water circulates through both. Are we building up dangerous crud in the pipes? Truth be told now we pretty much only use it when the kids come to visit, so even year Thanksgivings and odd year Christmas…, but they love it.
We have a hot tub adjacent to our pool, but it has a completely separate filtration system and heater - nothing is shared. Everything is Pebblesheen with a thick rough hewn bluestone coping, so it’s very natural feeling. We use it a lot - nice to take a glass of wine out there and look at the stars. Our system is also saltwater - no chlorine odor and very soft on the skin.
We have a decent hot tub we bought from a local dealer…it has lived up to the sales pitch. It is not expensive to run and we maintain it ourselves , We don’t use it all that often, but we do enjoy it. Winter use is a hit or miss. If there is ice or snow in the ground ( concrete and wood ) I usually turn it down
People soup.
And NOT the best half of them sous vide-ing in the hot water…
We have one. But it has not been working properly for awhile and is unusable. Can’t find someone to fix it near us.
We basically got it to have a reason for our teenage friends to have their friends over. And it was used a lot by our kids over the years.
H and I also enjoyed getting in the tub. Our yard is private,
I miss having it and would still like to get it repaired. But it is a lot of work to keep it clean and running.