So how (un) reliable is this hardware ?

[Amamba]

I just got TP2. I did search for h/w problems associated with it. Didn't find many at that time. Then of course I was comparing it with Moment which had many battery life complaints. So now I've had it since Saturday and already read about "rainbow banding" and blue spots on screen. Someone even complained about magnet on case leaving a dark circle on screen, which I never heard of happening. So how reliable is this device ? I intend to keep it for at least 2 years, should I just return it and get something else, or is the majority of users happy with it after months of ownership ? I'm only worried about hw issues, I can deal with problems related to ROM.