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For the most part, trouble free. Maybe some backlight flickering (its really subtle, like you have to be in the dark at lowest brightness, you won't notice it in most cases).
Whatever tablet you get, get a good stylus.

Have you tried turning off the automatic brightness?
32GB N7, no issues, love it to death. It's very versatile.
Whatever tablet you get, get a good stylus.
I don't use automatic brightness (automatic won't lower it enough in dark situations). And it only does it if there is wifi activity (reading an ebook for example won't cause it). Like someone pointed out, its a design flaw physically. There is a workaround taping the wifi antenna, but I've heard that can cause weird wifi issues.
So whatever, I've learned to live with it. I don't think about it anymore, and I just don't notice it. Simple enough.
I've had mine since the second week of August with no issues. When they did the software upgrade, I had random reboots, which turned out to be HD Widgets. I uninstalled that and have never had an unexpected reboot since.
I love this device, and use it daily.