I'm still on SX3 as well - it is quite snappy, doesn't hog too many resources, and am
debating with myself as to whether to upgrade to 5, but my experience with so much
software is that it reaches a performance vs features equilibrium - ie, is it better to
stay with an earlier release that is reliable and responsive or upgrade and lose some
responsive for the sake of a few plug ins - the pitch corrector would be useful though,
why don't Steinberg sell it as a VST for older versions, I suppose it might not run on the
older code?