I've sold a bunch of them a couple of years back, the only problems where after a few year the battery couldn't hold a charge, but most users kept them plugged in all of the time.
I'm looking to switch to something more modern, especially the Ipad which can also remotely mix presonus studio live boards. which I also sell.
but the fact that android has a bigger screen and I can probably find cheaper was getting me interested, but it looks like the ipad is the way to go.