S1 has used a Remington Titanium razor for the past three years. Likes it and it has held up well. I originally purchased it because it was on sale! Not a lot of research went into it. This summer he forgot the charger at school and so used cheapo disposable razors. That also seemed to work for him. I don't think he has sensitive skin, but he does still use ProActiv for skin care.
S2 has always used a non-powered Fusion razor with replaceable blades. He does have a more serious acne issue. But the Fusion seems to work for him.