I’ve owned many tuners, but this is the best. With a standalone tuner you have to plug your axe into that, and once you’re tuned up then you have to unplug and plug back into your amp or rig. Rack mounted tuners are nice, but not everyone has a guitar rig that is rack mounted. And even if ya do – you may not use it at home or band practice. The Boss TU-2 is a pedal that’s sole purpose is to be a tuner. Stomp on it, and all output to your amp or rig ceases while you tune. Stomp again and you’re playing like nothing ever happened. The LED’s to tell you if you’re in tune or not are big and bright – easy to use on any dark stage. This is the last tuner you will ever buy, and it’s WELL WORTH the money. The only regret I have about buying one is that I didn’t but it sooner!