Function equals value. you get more than you realized once you use it - Hogue AR-15/M-16 Beavertail Rubber Grip with Finger Grooves

My gun came with a smooth plastic grip, much like toy guns do. When you could get toy guns. I felt it actually detracted from the gun. It had to go.

This Hogue grip is sooo much better. It gives a secure comfortable grip. The stippling on the sides keeps the hand where you put it, but it's not overly rough, it doesn't feel like sandpaper or rip up your skin after a day at the range. It will keep your hands from slipping off on those humid or wet days.
The finger grooves fit my hand well. My hand always goes to the same place with no sliding around to find that sweet spot. With an easily repeatable grip, my trigger finger is always in the same place which makes for better consistency. Without having to slide your hand around a smooth piece of plastic to get find the right grip, you are able to take that shot faster and more accurately. Function equals Value.

My only regret is I should have got the model with the battery compartment inside. It's good for batteries and small tools like allen wrenches. Even if not used to store anything, it plugs the hole and keeps dirt and gunk out. I bought it afterwards, but the combined price was a few $ more than if I bought the combo together. It's also back-ordered.