I purchased the Stamina 36 inch Folding Trampoline about 2 weeks ago and I love it.  It was easy to put together.  The surface is firm and provides a decent bounce.  I am new to trampoline workouts and can definitely feel it working my muscles after each use.  The workout is fun especially with some great music.  I highly recommendend this product.  The price is very reasonable for the quality of this trampoline.