My daughter had been given with a magazine subscription such a keyboard and we found them all sooooo great, so I nachorderte two keyboards. My conclusion: after less than six months using several letter keys are completely empty, because the paint does not hold. Well, I write quite a lot, but at other keyboards I am not yet able to wear the keypad so.
The blue backlight like it very much further, but nothing helps when you do not 10Finger-blind writes what I thankfully do.
At least I now know what keys I use most frequently, but is it worth it?