Looking at the Z3 are identical size to the Z2200,they have twice the spec and the subwoofer is housed in a very nice wooden box.
I've not listened to either speaker system so I can't compare but the Z3s will superseed the Z2200.
Im thinking of getting them for my Psr3000,but im not sure if they will be alot better than my Yamaha MSP5s which I use for my P80 piano.

I certanly will be interested in those stands if I do get them.

Regards
Daz