From everything I've heard, the Highwood saddles rule. I love to mod guitars, and if I ever own a guitar with a traditional Strat-type bridge again, first thing I'll do is install those saddles then go from there. I'm interested in what the Callaham block does, too.
I actually have a couple of Musiclily blocks. Not that exact one, but I have a brass one and a steel one, and I liked the steel one better. More Straty for sure.
I kinda want to get the Highwood saddles to replace the block saddles that I'm using. They're nice, but I wish my Strat was more Straty at times.