actually, I did quite a bit of research on studio six's products and the reviews are pretty good. Even from industry 'pros' that compared that app to their full up rigs, the reviews were pretty good.
Just realize what you're buying. I wouldn't put all my eggs in that basket by any means, but for quick checks, level matching, etc, it might be cool.
I plan to buy that app and a couple others just for kicks, but only to have for 'toys'.