Only had it a few days but the build quality is excellent. The screen is as good as the iMac, albeit a lot smaller and the phone feels as well made as the iPhone. network reception is better than my iPhone 5. It has its quirks as do all systems, and will have to see if they update android if KK.The phone has only been on the market for less than a month.
Yes it does.
Like the above poster said, the update to 4.4 will depend on when MDTK releases the drivers for it. Glad the experience has been positive though.