It's terrible; the device is quite bulky and bigger than people seem to expect. I like the on screen keyboard, but it's not exactly fast or fully featured and the touch screen is too far away from your fingers in any comfortable holding position to type more than a name or a message here and there. It's also quite heavy if you hold it horizontal with only one hand.

With a docking station or a small Bluetooth keyboard you could probably turn the Deck into a portable dev platform, but it's simply not designed for text entry.