Hi Anne......I ordered STS yesterday, as a matter of fact. Cathe ran an awesome sale on the entire system and I have wanted STS for a long time so I couldnt pass it up.
I also have PUMP and dutchgirl is spot on about the pros of PUMP (obviously cannot comment on STS yet). I really like PUMP and love the barbell that came with the program. A couple of things to keep in mind about PUMP......there arent many workouts and only two of them are advanced. The music is AWESOME and the best I have ever heard on an exercise DVD but there is some ego to deal with by the instructors. Nothing too bad and it didn't bother me the first few times but after awhile the body worship got to me (it's mostly with the guys and might not even bother you).
I would not part with PUMP but there's just not too much to the package. If you buy the three cardio workouts (I think at $40) you have a complete system, I just wish there had been more workouts included in the price.
I think I am going to be happy having both and will love both....for totally different reasons.
Just wish you could've gotten in on yesterdays sale. STS was $87.00 and free shipping, I already have a shipping notice and delivery is next Monday.
Good luck with your decision