In reply to birdie num num:
Lowering it only upsets the handling if not done properly.
My SV was lowered, but only the rear - previous owner hadn't dropped the forks through enough to compensate and it was a pig round tight corners with the slacker head angle.
I've now put it back to correct height and it's a different bike.
If you do lower it, just remember you won't be able to get it over quite as far before the foot pegs catch, but unless you're a serious knee-down merchant on a sports bike, that shouldn't be a problem - if you're that far over on a TransAlp, you've probably fallen off anyway