Don't be sad - it's a great product that seems to be 95% there. It really does sound great when it works. I do think these plugins are outstanding but I've noticed an undercurrent of people that I meet moaning about reliability and I think if you could nail that it'd be great and probably good for business.
I'm on Mac OSX 10.6.8 running Pro Tools 9, but I did try it out on two different Macs, an HD rig and something else - I can't remember as they were on other computers. Oh, also in Logic.
I was getting stuck notes (I really noticed that when using arps) - needing to reactivate and deactivate the plugin to stop it. Loud explosive crashes where the plugin made mad noises (some of them quite good). Worst was running two instances in the same session, both would crash and the settings would vanish after I had deactivated and reactivated them. I think that's as specific as I can be as the behaviour was erratic. It's also caused Pro Tools to crash a lot.
Hope that info helps.