In reply to Dom Orsler:
Petzl spirits are a lot easier to clean from steep sport routes too. They seem as light as wiregates, but i reckon that the perceived lightness is due to the higher "chime" you get when wire gates (or spirits) knock together.
To be honest, I find the lack of a notch more of an advantage when unclipping anything. Oh, and they're sooo expensive compared to something like a WC Wild Wire Quickdraw set.
Anyone seen the DMM wirelock things?