Korg sounds grown-up enough to me, but it's just too obvious that accompaniment doesn't work smooth enough... Roland's accompaniment sounds a bit mechanically to me... It's like playing styles on a keyboard which were designed for another one. Well, a guitar voice is ... misunderstanding.

Casio, sadly, does not really changes the common prejudices against it. It's not a bad keyboard to start with, and I'd be happy to have one as a gift. It sounds decent enough even to perform in public or on stage.

But it's hard to ignore that Yamaha's keyboards do indeed sound grown-up as well, with no problem with accompaniment and do not cost that much higher than Casio's do, so I feel like I'm forced to appear like a closed-minded person who's being groundlessly favourable towards Yamaha's products, yet I'm trying really hard to see some alternatives. Not successfully so far...