I played with one of these a month or so ago and will definitely get one for my more musically oriented child to play around with. They're fun and a different way at making synthesized sounds, the UI is reminiscent of handheld game consoles. Beware though, these could very well be a gateway drug to a house full of gear ;)
You can't ever overcome synth GAS... I have a music studio full of latest greatest toys and it's never enough... Better excise it right in the beginning or you are lost forever ;-)