I have the Savvier discs for use on carpeting and a set from Gaiam that came with a Pilates dvd. They both work fine - I can't say I prefer one over the other.
As for workouts, I like the 3-in-1 Ultimate Buns/Legs Workout, Fat Burning Cardio & Total Body Sculpting DVD that came with the discs as a set. I had
Booty Beautiful but I traded it a while ago and I can't t really remember what I didn't like about it but I'm thinking it had something to do with it not being all that lower body focused, but more of a total body workout. I guess with a name like Booty Beautiful, I was expecting more booty work.
My favorite workout that uses gliding discs is probably Tracie Long's Better Burn Better Buns. A great lower body and core workout with cardio intervals.