Ultra-aggressive grip tape aids in reloads. The non-slip surface will help you maintain contact with your mag's basepad as you quickly guide it into your gun.
Keep track of which mags you're using. In competition, if one mag is giving you trouble, you can easily tell which one it is by the bold number on the grip tape. Always use the same magazines in order and if one malfunctions, take that number out of rotation and finish the match. Then, when you get home, grab the problem mag and get 'er fixed up. Numbered 0-5 or 6-11.
Multiple color options allow you to differentiate between sets of magazines (practice vs. match, different calibers, different capacities, etc.)
For Steel Challenge matches, always know which run you're on by using mags 1-5 in order.
