I'm looking to upgrade the tune o matic on my G400 for better intonation and possibly increased sustain. I'm looking at Nashville styles from either Gotoh or Tonepros. The Tonepros is almost twice as expensive. The only real difference I can see is that the Tonepros can be locked down on the studs. Are there any other differences? What's your opinion, is the Tonepros worth the extra cash or will the Gotoh one work just as well and save me some money?