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)