Been using them for probably 15 years or so...can't remember now.
Had them on...had them off...had them back on again...had them back off again...
I finally got it where I like it! I just use the string savers on the 1st and 2nd strings (the high E and B) because those were the main culprits for string breakage. The other 4 saddles are just steel. I would rather use all steel because I personally hear a slight dampening of the high frequencies with string savers (very slight.....) but I'll be darned if they aren't the best thing since sliced bread for saving strings!!!!! When you're gigging, that's pretty much the most important thing.
Save yourself years of fiddling around and do what I did. Oh who am I kidding...you gotta figure out what works for you right?
The best thing you can do to increase your value as a guitar player is learn to sing. But most guitarists don't want to hear that, so we mod instead...hoping it will compensate.