We have had this up for almost a year now and we could not be more happy with it.  I will admit that I did not assemble it (my husband and father did), so I can't comment on the difficulty there, but it has held up through a summer and a winter.  It has good bounce (even for me as an adult), but no one has made it high enough to get over the safety net.  I did not go back and tighten the screws a month after assembling like the instructions suggested, but I will probably do that as the weather gets warmer this spring so we don't bounce too many of them loose.  The springs do squeak a bit when you bounce (as expected of a spring) but not so much that it is annoying. Overall my two sons have had hours of fun with their friends on it, and it was well worth the money we spent.