I have a Fobus for my "J" frame S&W and it works great. It is hard on the cosmetic finish (scratches/gouges) though and I wouldn't even consider using one for my parkerized P3AT.
I also have a Pro Tech ankle holster for the "J" frame, worked good before the elastic wore out. Not as good as the Fobus.
I too am looking for a decent ankle holster.