I have a Classic Series 50s Stratocaster, a Mexican Fender that in my humble opinion has almost nothing to envy to American models. Except maybe for the tremolo assembly and the tuners (made by Ping in Japan). I want to point out that I'm convinced the sound and tone are not really affected by this upgrade, which is actually a matter of materials, reliability and durability. Usually, the typical upgrade kits are Gotoh or Callaham, although some could argue about what's the point of spending 150 US or EU bucks on a MIM guitar just for a tremolo: the upgrade could be limited to the zinc tremolo block to be replaced with a steel one (but a Callaham goes around 90 euros!). Prices around here for a tremolo kit are: Fender Original Vintage: 148 euros + shipping Gotoh GE101 (steel block): 92 + shipping Callaham Vintage: 169 euros + shipping At first sight a Gotoh seems a no-brainer. I've read AVRIs use the Gotoh bridge (and tuners). Why not Fender Originals (or are they made by Gotoh?). Does the Fender brand cost 60 euros more than Gotoh? I know many regard the Gotoh bridges as excellent. Most favor the Callaham. What are the real differences? And what about the Fenders? One could consider the option of upgrading just the block and maybe the saddles. Someone would also suggest to spend a few dollars for 6 Callaham screws... But a Callaham block + saddles + screws almost totals the whole kit (unless you find some used stuff). What is your experience about this? Is the Mexican Classic Series tremolo really rubbish?