Well I haven't done my 21 yet, just my 36. I have the Talon Grip on my 21 and it feels really good. Eventually I will stipple the 21, just don't know when.
I like the way stippling feels and it is permanent compared to the tape. I don't care for a lot of stippling, just where the fingers go across the front and where the palm makes contact on the back strap. If you stipple the sides of the grip it can be a bit rough on your skin if it touches it.
Someday when I figure out how to post pictures I will. I take the finger bumps off, round the front of the trigger guard. Undercut the trigger guard for my second finger and smooth all the edges. I then Glass bead blast the frame to give it a nice uniform satin finish to blend everything in.
The Evil Captain Kirk