It doesn't seem like we use it much, but we do. They take awhile to deploy, because the cowls have to translate back for them to operate. Then the engines have to spool up, and we pull them back to idle at 50' agl. Then, they can't stay at full power above 60 kts, so we have to stow them early. Anyway, a lot of people think that the things that stop a jet are reversers, spoilers and brakes, in that order. The correct answer is brakes, then spoilers followed by reversers. The reverse thrust isn't even used in performance calculations on a dry runway. And, the main purpose of the spolers is to get more weight on the wheels so that the brakes work better. Oh, also, you can't hear the reversers much because the engines are so quiet, and they are just reversing the fan air, not the core air. Jets with reversers that use all of the air are much louder. Hope this helps you.