I've had some work done to mine, and did a little myself.
Mine was a third gen 17, and I had the grip chopped to take 19 magazines. It was then stippled, and some other stuff done. I still hated the finger grooves, and that goofy hump on the back... so I took matters into my own hands. Finger grooves were ground off, and the backstrap was heated and rolled a tad to help flatten it.
Made all the difference in the world. I surmise that a grip reduction would accomplish the same thing, but as easy as these mods were to do, I'd do them myself. It's only plastic.