it would be of some interest for me if you (someone at vsl) did some testing on macs too before releasing, it´s a matter of can-i-buy-or-not (immediately, i definitely will eventually), and i´d love to (having waited for this for longer than you may imagine).
it´s not that important to me (to whom?) to have all micings loaded at the same time, and if imperial really adresses its own memory, well, this would be just great for me. i could have my 4 gigs for old-school vsl, say 2 gigs for imperial, leaving 6 gigs for system, logic and exs (and the other software instrument-"company-who-must-not-be-named" - a**holes). fine for me.
my credit card is shivering with anticipation - up to you now :)