Grip angle, storage compartment, beaver tail, matching colors - Magpul Industries MOE K2 AR-15/M4/AR-10 AR Pistol Grip

Pros
Upright grip angle
Storage for lube, or paperwork, or whatever in the heal of the grip
Strorage door seems very sturdy, won't fall open
Beavertail for web of hand instead of resting your hand on the metal lower, extends distance to trigger for long fingers
Black, ODG, FDE and Gray to match most color schemes
Tight fit on lower
Included grip bolt does not require washer, so a little easier to install and remove when needed
About the right amount of diameter for my size L/XL hands

Cons
Well, nit-picking here, but I do like the idea of a grip that either fills or covers the gap to the trigger guard, but I have never pinched my skin in that gap so I'm not really sure there is a lot of value in doing that