I've considered it but gave up on it because devices already come with chargers. Also that the amp requirements of devices is slowly creeping up and the manufacturers of accesory chargers (such as these wallplates) seem to be a year or so behind. Plus I'd end up with odd wallplates. The advantage is that you keep your 240 volt powerpoints free, but then you could just have a 4 GPO or 2 x 2gpo's, and you have flexibility of room placement if you've got 2 x wallplates.
QI (wireless) charging is a more attractive thing for me.