Love, love, love this trampoline!  We had a 13' round and then upgraded to a 15' round.  My kids got great use out of them but they were pretty beat up.  My son does gymnastics and the rectangle was recommended to practice his stunts.  The rectangle offers so much more usable space as opposed to the round!  It takes up so much less space in our yard too!  Both of my kids jump at the same time and get great bounce, unlike the round where only the person in the center gets good height.  Assembly was very quick and I am very pleased with the way it looks.  I would highly recommend this product!