I have a spring Bellicon and a Cellercizer, but I didn't know what I was missing until I tried the bungee Bellicon.
My first impression after my first few bounces was that it is really quiet. Then I put my other rebounders right next to it and jumped back-and-forth.
There is no comparison! The bungee Bellicon is far superior! It is so quiet I don't have to worry about waking my husband up as I bounce away into the night.
I was considering the larger one because I wanted to have lots of room. I am 5'5" and the 44 inch is just the right size. I have the extra strong bungees and even though I am below the weight limit for them (I don't think I've ever said that before) they are perfect.
I was going to keep one of my spring rebounders as a backup, but I don't think I ever want to use them again.