I love my Sony prs 505. It's the first and only reader I've had. I've played with others in shops but never been tempted to purchase a new one.
Unfortunately, the battery is nearly dead, I do have a new battery for it but I've been waiting for the courage to let a friend of mine change it. At the mo, I keep it plugged in while in use and take paperbacks to the doctor's etc.
From what I've seen of the T1, I'm not impressed enough to buy it. Don't think I'll buy another unless the 505 completely bricks. Would leave a respectful period of grief though.