Just got my Z1s yesterday and the screen, when looking at a direct angle, is absolutely gorgeous. I've used an LG G2 for a while and it's easily as good if not slightly nicer, so it seems there is some variation in screen quality. On mine all colors are very vivid, no yellow tint, quite lovely.
At home I'm getting about 28mbps for LTE, and have noticed that signal reception seems very good, and GPS lock was almost instant. At my office in Boston the Z1s seems to hold on to LTE better than my Moto X, though speeds of the 4G the Moto X gets are about the same as the LTE speeds the Z1s is getting (around 6mbps in the middle of the day) so not much of a practical difference.
Plastic sides have a matte metal look to them, and I don't even notice they're plastic so that's a non-issue, at least for me.
At home I'm getting about 28mbps for LTE, and have noticed that signal reception seems very good, and GPS lock was almost instant. At my office in Boston the Z1s seems to hold on to LTE better than my Moto X, though speeds of the 4G the Moto X gets are about the same as the LTE speeds the Z1s is getting (around 6mbps in the middle of the day) so not much of a practical difference.
Plastic sides have a matte metal look to them, and I don't even notice they're plastic so that's a non-issue, at least for me.