I got one of these in xmas 2007 (I think), a 605 wifi 160gb. It's a fantastic piece of kit when it works, but the reliability is on par with the 360's I've had..
My battery died xmas last year, got it replaced a week before the warranty ran out. Then the hard drive died the same day it got back, and I managed to get them to fix it.
Now the touch screen has died, and the hard drive corrupts itself semi weekly, usually while im trying to watch something so I have to go back and put backups back on and hope it lasts the rest of the programme.
I wonder if this is another way of trying to make me upgrade and sap my cash, like all those plugins I had to buy. Still, for the year that it worked, it was very nice.