I found the timing of the kind of combination healthbounce and dance that I do was just about the same as it is on the JumpSport550. The main difference between the two models is slightly more room on the PROBounce, making me feel a bit more stable. The only advantage I can see in the more expensive JumpSport are the thicker adjustable bungee cords with a better warranty. Only time will tell how long the PROBounce cords may last.
available links, each play differently on their hosts:
music is blocked in Germany and on some devices by youtube
I will continue doing my morning workouts in the basement on the 550 because of the dvd player/tv/stereo sound system/mirror and freestyle to MUsic throughout the day on the PROBounce in the living room.