Disklavier

I found this egroup a few weeks ago after we purchased our Disklavier.

It was delivered today! Yeah! Anyway we purchased a Yamaha MX1 or MX1Z I
can't remember at the moment but the difference between the two are subtle.

I've already downloaded a bunch of Christmas and Billy Joel midi files that
were in the egroups files, can't wait to give them a try.

Anyway, my question concerns my two children, mainly my youngest who is 4
1/2. I was wondering what sort of resistence this piano would have to just
letting him "play" with it. He's been around a piano at grandpa's house and
knows not to bang at the keys.
Actually as I type he is tapping out "Three Blind Mice", which is far better
than anything I can play :-)

So will he be okay just playing around at the piano, or should I limit him
to when we get an instructor in here to teach us all? I'm afraid if I won't
let him play I'll squelch his love of music but at the same time I don't
want him to damage our investment.

Thanks
~Stacy