They work very well. They're small but easily handle my Fender Supersonic 60W 1x12, which weighs about 55 pounds. The only thing to watch out for is that the screws that come with it are long and of good quality. Unfortunately, I thought they were long enough to go through wood and damage the reverb tank, so I replaced them with slightly shorter screws. Now I can stop breaking my back lugging the amp around. Another pro tip: DO NOT roll the tube amp over uneven surfaces. Only roll on smooth surfaces if you want to save on hoses and the like. These wheels have no suspension!