I just like the feel. The camera fits into my grip better.
Woo! Matching halters and straps - those are surely a pair of hotties!
Mark and Robert, I agree with both of you about half cases being useful for holding the camera. I use them with my smaller slrs: OM-1n and FG, but not with anything larger. I'm not sure about the Leica. I tried it with Michael's (mhcfires) halfcase, but I think I prefer to handle it directly.
Can I ask, what kind of soft release buttons do you have fitted there ?
One is a Nikon AR-9, which have become a bit rare. The other one is an AR-9 clone - which can be found on ebay quite reasonably.
I do like the "bug" releases, though. They look like a lot of fun.