I have a layout I'm building with Bachmann EZ in N scale. Not a single problem yet. I've been running all of my locos on the track and my curves are 11.25 in some areas. Still, no problems. I haven't hooked up my turnouts to operate remotely yet, but when I do, I have a plan for making them easily accessible from underneath.
I decided to use EZ because it was my first jump into model railroading and it was recommended for beginners. The only thing I don't like about it is that it's a bit limited in pieces and options. I have no experience with laying my own track, so I think I will switch to Kato Uni-track for my next layout.
So, for me, Bachmann EZ has been super easy, no problems. I just wish I knew about Kato first since there are more options for track pieces. The Kato plastic track bed is a tad narrower too.
Oh yeah, don't buy it used unless you're willing to deal with some failure. It bends easily and some of the used pieces I bought needed some tlc to work well.