We use the free version. There seem to be so many to choose from that we won't run out of stuff to try any time soon. And yes, I think I will be sore tomorrow, especially my legs, from doing jump squats with a 15 lb dumbbell in each hand, and which are not usually on the program.
I know what you mean about the voice ... A couple of times she said, "15 seconds left ..." And I was thinking, "I've been doing this for at least 15 minutes already!"