I can testify to Callaham.....I put the trem block, saddles, and stainless trem arm on my Vintage 50s Strat (Daphne blue) last year. The results are very pleasing. Tone is enhanced as well as sustain. I also have the Callaham intonated brass saddles on my Japanese tele. All of their products are said to be amongst the best and I believe they are.
(I replaced the stock pickups on the strat with 69s at the same time as the Callaham upgrades.....as nice now as most strats I've played)
GUITARS: Fender Teles and 50s Strat, Squier Jazz Bass & '51, VooDoo clone, Dillion Tele Thinline, G&L Tribute ASAT, Agile Les Paul clones, Rogue 335, Robelli D'Angelico, Danelectro Hodad 12, Larrivee Koa Parlour, Blueridge 00028, Ibanez Hummingbird, Takamine EC132C, PRS McCarty IRW.
AMPLIFICATION: Carvin Bel Air w/ext cab, Behringer ACX1000, Vox Brian May, Fender Bronco tweed, Rogue 30 Bass, Roland Cube 30, modded Epi Valve Junior w/ Scumback 1x10 cab.