Does the trigger grip for vita really help?

I want to purchase a trigger grip for my original vita for my upcoming trip! It's $14.99 at GameStop(I don't want to order online because I leave Friday and 1 day shipping is going to cost me more than the grip itself.. So online is not an option) I usually play games like FIFA Mine craft Injustice Spider-Man And call of duty

Is it worth it? What do you guys think?