I took Kaplan, and was very satisfied.
That satisfaction stemmed minimally from the actual review sessions taught by Kaplan tutors. Those are nice and all, but you're kidding yourself if you think 9 hours per subject on Bio/Orgo/Chem/Physics is going to get you very far.
(Plus there was the fact that we had a new tutor for our final Orgo review session, and I ended up basically teaching half of the material to the rest of my class b/c I knew it so much better than him).
What I found valuable with Kaplan was the material: as many practice tests, full-lengths, question banks, etc. as you could ever hope to do. I could have gone in every day for a full-day from the time I started the course to the day of the MCAT, and I don't think I could have gotten through all of their resources.
I don't have too much to compare to with TPR, though I've heard much the same as other posters above noted (more review, not as many out of class resources).