We have had our trampoline for over 6 months now and can say that the quality of the bounce hasn’t diminished.  This trampoline is huge-not meant for smaller yards.  Assembly absolutely requires two or more.  As per the packaging, we downloaded the “Bilt” app to assist with assembly-it was pretty helpful.  Our girls love their trampoline and get to practice their tricks from gymnastics.  They find the trampoline is as good as the professional ones at their gym.