They are really big for a vertical grip, but since they have a built in bipod I can overlook that. From my experience they are not as solid as a true bipod when the legs are collapsed. I've messed with a few in the Army and used one a couple weeks ago. Personally, I like just a stubby vert grip.
What makes the green grass grow? BLOOD, BLOOD, BRIGHT RED BLOOD!
Whose blood? THE BLOOD OF MY ENEMIES!
What is the spirit of the bayonet? TO KILL, KILL, KILL WITHOUT MERCY!