This is our 3rd, not sure of the brands before.  My kids jump them into the ground.  They really wanted a rectangle one, however they were too expensive.  We saw this oval 17' and the price was decent.  It looks more round but you can see that it is slightly oval, hard to tell because 15x17, we are happy with it.  It's large enough for my kids to do their flips and not land at the end.  It was easy to put together, only mishap was that we initially forgot to spacethe sides with the slots for the poles of the enclosure on every other one, no biggie though.