Everything has worked fine for me. No reboots, no glitches, if the infamous "blue line" is there, it's so minor that I haven't noticed it.
Brightness is perfectly adequate for my uses. If the color is not perfect, I would only notice if I put it side by side with another tab, and I haven't done that, so for me, it seems fine.
Contrast might need some work. I'll have to see what adjustments can be made sometime later.
I've rooted, installed TWRP and I'm all set for whatever ROMs come down the road.
One thing that I wanted to do with this tab was to replace an aging netbook that I lost recently. So, I've paired the G Pad with an Anker bluetooth keyboard and I'm using a standard Logitech wireless mouse that's connected by OTG cable. This setup works great. It pretty much turns the pad into a mini laptop.
So, bottom line, after 2+ days, I'm very happy with the device. It does everything I need it to do. When set up with the mouse and keyboard, it's a great laptop replacement. Used in hand, it's the perfect size for reading and watching videos.