I have the Hogue grip on both my Glocks and I love them. I also have them on some of my other handguns. They are fairly cheap so you can always try them and if you don't like them you can just take them off.
I've been using a sheet of "Skateboard Tape" for various areas on different guns that I need a little better grip on.
You can find skateboard tape really easy by the sheet at amazon.com. The sheet I bought was huge, something like 12" x 24" and it was about $6.00 -- enough to last me a lifetime!
I cut some small strips for the slide rack area on Glocks. Also excellant for the polymer area on Surefires' fore grip light on my 870. A small piece of tape on the polymer where finger tips are placed make for a really positive rack for the shotgun.
Go to your local skateboard shop and get your own adhesive backed skateboard paper. Cheap for a large sheet and you can cut to customize. Use a Bic lighter to warm the adhesive before you place it so it will stick good. It will last a long time and when you take it off you can use "Goo Be Gone" to take off any residue. I have used it on several guns. Be careful though, it is very rough and can wear through clothing from repeated rubbing.
Try a shopping trip to your cell-phone accessories department at Radio Shack, or similar. They have micro-thin peel-n-stick adhesive pieces for cell-phones in MANY styles and colors -- even hot-pink and camo! 15 minutes with a pair of scissors and you're in business. Plus it is 'grabby' but not tacky or rough. Pat.