I have used a rebounder off and on for many years. They are great for exercise as well as increasing your immune system…and they are just plain fun! I have had a few different models ranging in price from $14 all the way to $50. In my opinion there was no differnces. The $14 ones worked just as well as the more expensive ones. They also range in size (hence the difference in price to some extent)and I have found that the smallest and second smallest in diameter work just fine. Many times you can find them on sale at Big 5, Target, and (gasp) Walmart. As far as quality goes, I had to keep buying rebounders because I kept giving them away, not because they were of any different quality as compared to price.