I was surprised by the overall sound, definitely it's not a toy, it's much more than that.
Installation was OK, the manual is pretty poor, but you can get thru it and assemble everything more or less easily.
I wouldn't imagine it was so loud. It's quite easy to dampen the sound of the snare and the tom. I am working on doing the same for the kick drum, but the cymbals besides saying "low noise", it's quite hard to make them sound more quiet without making them sound like a tin can.
As soon as I narrow down the kick drum sound, it's going to be pretty cool. Our son loves it already. He's almost 2, cannot reach the kick drum properly yet.