Tutors are good, and if you factor out the money they can definitely teach some good tricks. I guess depending on whether you're an intrinsic or extrinsic person, that could be a factor as well. I've had lots of tutoring, but never used it to its potential. Now that I care about the SAT's I definitely will be using it to its potential.
Personally I just ordered Dr. Chungs for math, was very highly recommended as well.
If you do get a tutor, that won't do it by itself. Do at least 1 section of math every day or more, along with whatever the tutor assigns you, and what you do with them. I'm doing a full practice test per day with a tutor coming once every week alternating math and CR.