The sound, feel and ability to play well. That is what you need from your guitars. When these tasks are accomplished guitars and basses they are greatly improved. It happens when they are set up correctly, the right parts are used and adjustments are exact. Regular maintenance and servicing however is required on your guitars from you. In the case of, truss rods, they need seasonal adjustment to keep the neck straight. They fight a constant battle between pull of strings, truss rods, tremolo systems and humidity. Guitars operate smoothly and in tune when set up properly. If a setup is done right it will match any chosen string gauge.