My limited experience with Planet Waves trim-locks has left me less than impressed. I was suspect of the design to begin with, and experience bore out my suspicions. The string-trimming feature is subject to rapid deterioration, and may not work well right from the start. I've only used about 4 sets, but unless somebody twists my arm, those will be the last of them.
I'm a huge fan of locking tuners, and wouldn't have a guitar without them. But, I'll always use the Schallers or Sperzels. They do it right. Gotoh, Grover, Kluson et al make them as well, but they're also-rans. They're not worthy of your money.
The string trimming function of the PW parts is a gimmick. If you're lucky enough to get a set that work, it's unlikely they'll work for long. It's a nice idea, but to do it right would make them cost far too much for them to ever sell.
Think about it. You're asking them to cut nickel-coated tensilized steel. Unless the posts and the cutters are made of something much harder and to very exacting tolerances, how long do you suppose they're going to last? If you play a lot, you might be changing strings once a week, perhaps more. How often would you like to change tuners?
