I won a Guga Ribas holder and pouches at yesterdays WCSC raffle. I was using a CR speed wsm2 until now. It locks up much more solid than the Ghost or WSM2 holsters that I've tried. You can adjust the lock to perfectly fit your gun. I shoot a Czechmate and it wasn't easy finding an open holster for it.
I'm still playing with it, and I may need to adjust it a little more. The draw is so easy I'm worried I may knock the gun out of the holster if I miss. When the lock is engaged, it doesn't move at all. No shifting. No rocking.