Still using mine for work, developing software on a MBP. Having a 9 meter screen anywhere and any time I want it is pretty nice. It's clunky, and needs to be connected to power, and takes some time to get reconnected every time I put it back on, but it easily pays for itself with the increased productivity.
Almost never watch anything on it, or use the apps built in to the device. It's 99% used as a big monitor for the MBP, and finally the sound works.