P90X - I could not do more than a few of the workouts, I was really bored and I am just one who can't deal with Tony's personality on his dvds, he does seem to be a love him or leave him kind of guy. I would say though if you DO like him, the workouts are probably really good for weight loss, I definitely can't deny this is an effective set if combined with proper nutrition.
STS - Amazing strength training. There is no other program out there like it at all. You need to add in your own choice of 3 days of cardio, it does not come with it. I did the full rotation twice, I don't really lose weight with it, but others have, and that's really mostly about the nutrition. I did definitely gain strength and muscle, even to the point that certain shirts were just ridiculous tight on my arms. Some of the workouts clock in over an hour, and if I'm not "feeling it" that day, it's hard to commit to such a long workout. So my only slight negative was sometimes I just needed shorter workouts.
XTrain - Best complete program I have. Cathe seriously hit a home run with XTrain! I am starting week 6, and still looking forward to each workout, I can't say enough good about this set. There are workouts in here I thought there was no way I would like, and I love them like the HIIT one. I am still a little scared to try Tabatacize, but I'll get there. I do mix in some other cardio to keep it fresh, mainly a heavy bag class I take at my gym. Supercuts is my new favorite since I tried that one in week 5. Because of the nice mix of different times, I can always shuffle the week to get a shorter workout on a day I need it if I am short on time.
It's like Cathe took every comment from every post over the years and created this set of workouts. The music in the ones that matter (aka, really need the beat) is great and motivating, the workouts are all under an hour, many under 50 minutes, there is very very little repetition in the workouts, she even breaks up workouts with different segment types to keep it fresh like HIIT and Legs, there is low impact and high impact, there are heavy weights and light weights, she provides tips on modifying, they are hard and challenging AND fun without being CRAZY hard so I have no dread in doing any of these (ok still scared of Tabata
).
My only dislikes: Hard Strikes, I LOVE kickboxing and boxing workouts so this wasn't enough of the punching combos for me, and just not what I had hoped it would be, but I like adding on the Conditioning segment to a leg day. I wish I had a heavy bag for the heavy bag Tabatas. And I don't like the floor and chair sections of Legs, but that didn't surprise me, I can't stand floor work at all.