Looking at the photo's, I realised I've actually had one of these in the past but it wall all white, not the black key version. Sadly it went very yellow. I retrobrited the thing and after putting it back together the plastics had lost their smoothness. To be more specific, the plastic's looked fine to the naked eye, they'd returned to white, but the keys stuck when you pressed them as if they where coated in some sort of abrasive. I washed them several times, tried various things, but could not get it to work properly. Eventually it went yellow again, but I'd already shoved it in the attic until I came up with a solution, which I never did. Eventually threw it away last year, giving it up as a lost cause.
The one I've bought it complete, the guy said nothing is broken