When I first got mine, it was great. Had no issues, aside from DMClient crashing immediately upon turning it on the first time. Over the last week, its developed the clicking in the lower left corner... not a big deal, its not something you'd trigger with everyday use. Then I realized I never got an OTA, and when I tried unlocking the bootloader that failed too.
So I decided to try a factory reset, figuring that DMClient crash was the culprit. And upon the completion of that reset, my wifi seems to have died. It can see my network, but it stays on "Obtaining IP Adress" for about 10 minutes, before switching over to "Avoided poor internet connection". It kept doing this through multiple reboots, and even after I tried another factory reset.
On one hand, I'm disappointed as mine had pretty good build quality compared to some of the complaints here. On the other, it gives me an excuse to return it to best buy and get one that'll hopefully allow unlocking. I'll be exchanging mine tomorrow, and hopefully its replacement will arrive soon.
Current phone - Nexus 4 16GB (CM10.1 RC2)
Current Tablet - Nexus 10 32GB (CM10.1 Nightly)
Previous devices - Motofail Backflip (CM7.2 Stable), Motofail Atrix 4G (CM10), HP Touchpad (CM9), Asus Transformer TF700 + dock (rooted stock ICS), Nook Color (CM7.1), Samsung Blackjack II (WinMo 6.1)