I only have one a Sony PRS 505, and I love it. It have worked flawlessly for the last 2 years. Yes, it has it quirks, but I love it. Despite the fact that I love it, I must admit that I am tempted every time a new device is announced. But, I need a backup. I realise that, since I had a scare a couple of weeks ago. After the scare, the battery life is worse, and it drains faster
. So I'll probably buy a PRS 350 or T1 sometime this year.