After looking at several websites, it appears to me that the TRX straps have some sort of resistence bands tied into the straps themeselves.

AS for quality, I understand all of what you said... I have lots of straps around the house/shop as well... and pershap that's why I think there is a big difference. Although perhaps there isn't...

Your PT will have some valuable information, and I appreciate you asking. I did find out today that the Jungle Gym brand does indeed have a life time warranty.. so that's impressive!