I have had my Bladerunner for almost a year, and the arm is fine. The steel spring loosens a bit over time, and doesn't feel stiff anymore. It is an improvement over a regular 6 or 2 post bridge, as there is no friction on the bridge's front edge. Locking tuners, a GraphTech nut & saddles help return to pitch, although for the first few months, the G would never come back in tune. I will say that the method for tightening or loosening the swing of the arm is bad....you need a screwdriver and an Allen wrench to do it, and it is easy to strip the top of that plastic nut (I did). They sell replacements, but this design is clumsy anyway- music man uses a pop in arm with an Allen wrench tensioner- you set this once and never have to do it again. I am constantly fiddling with the tension of the arm on the Bladerunner, since it never stays where I want it. Still, I like the action of the Bladerunner, but would change a few things. It should come stock with graphite saddles, or saddles with graphite inserts. The arm sits a little high, and I hate that it doesn't pop in. The arm tensioner system is wacky too, but all these in kind, I like it better than most traditional type trems.