I have heard many positive comments on here about both the Hogue Handall Jr and the Talon "iron-on" grips. Both wife and I went with the Talons on our LC9Ss and couldn't be happier. They add just a TINY amount of thickness, but a substantial amount of "grip". Look pretty good too! Installation is just a bit fussy, but if you go slow and are careful, they can be perfectly fitted.
I just installed the Talon stick on grips to my lc9s. Really like the feel. I put the rubber type on rather than the sand paper type.
Really easy to install, helps grip the pistol with the mag installed without pinky extension.