I got the ps3 version during the TRU sale. Decent, but still has flaws. I finished the 9 week program, each session is supposedly ~30 minutes and progressively increases in length and intensity. But including all the "filler" time, it usually takes about 1 hour to do each workout. I did medium, and the exercises left me sweating and sometimes sore afterward, but they were never frustrating enough to make me not complete them, like say forcing me to do 100 situps or something. I never tried the 3 week cardio course yet, but that is all it has 3 week or 9 week. I would prefer if it offered some shorter preset workouts, because I don't want to start the 9 week, 4 days per week program again. It is really a committment if you follow through, which is good and bad. The tracking can be really frustrating sometimes, but I guess this is the closest thing to having a trainer watching you.
And make sure you have spare AAA batteries or rechargeables. The ones they give you won't last for the full 9 weeks.
edit: Actually I just saw that it is supposed to let you design your own custom workouts. I thought it was supposed to have that, but swear I couldn't find it when I looked the other day. I will have to try that out. Would still have preferred a few shorter preset programs thrown in though.