Stipple

Textured thumb supports are located on the side of the frame where your thumb naturally sets. This can help you to maintain a proper grip every time.

Accelerator cuts are a small "ramp" on the sides of the frame where your thumbs naturally sit and can help to control recoil and muzzle flip. I recommend you have it on your support side.

Instead of buying an extended mag release button I suggest taking a small amount off of the grip which allows better access to the mag release for smoother easier access.

Undercuts can help with a higher tighter grip. The single undercut is below the trigger well and allows you to gain a higher grip to help with recoil. The double is a combo of the single and then you take a little bit off the bottom side of the trigger well to enhance an even better grip to manage recoil.

Borders are pure cosmetic but take additional time. If you want a good looking recessed border to add to the look of your firearm then I suggest you do borders. You can have the Channel borders (which retain the backstrap lines) where you have the option to add/remove your backstrap.

If you have a firearm with a backstrap option you can have it integrated (attached permanently by melting the backstrap to the grip) at no additional cost.

For the Glock Gen 3/4 owners, due to having finger grooves, you have a few more options to upgrade your firearm. 

I will suggest to anyone to remove the finger grooves. I like having the option of hand placement. I feel like I have better control when I can put my grip where I want it, not where its forced to be.

The enhanced finger groove replaces the single undercut. It gives  you a bigger better grip right up under your trigger well. Not only does it look really good, it feels really good too. I would recommend doing both if you want to remove your grooves and have an undercut. But you can maintain your grooves and add the enhanced groove instead of the single undercut.