New PRS-505 fan here. Never thought I'd want one, but I've been reading on it non-stop since my amazing hubby gave it to me for Christmas!
After working perfectly for two week, now it's giving me problems. Menu key is stuck...zoom doesn't work anymore...and the Mark key also doesn't work. I haven't dropped it or got it wet or done anything wrong. So I
can start a book and keep reading to the end and then must do a reset to go back to the menu. Grrrrrrrrr. I've tried to hard reset, which doesn't work because (ta-da!!!! the menu key doesn't work!) I'll start reading the posts about Troubleshooting, but a cursory glance didn't magically reveal a similar problem to me.
Anyway... still a fan!