I think the screen separation issue was addressed a while back by HTC. The light leakage at the bottom, however, not so much. If you're at all concerned about it, it's nothing a little dab of black silicone, a damp paper towel, and 5 minutes of your time can't fix for good.
And just to be clear: the screen separation issue was where people's screens were literally separating and peeling up from the phone's case due to bad glue.