Have only tried graphtech saddles on my Strat. The tusques made it a lot brighter than the vintage originals and added a little more sustain and an almost acoustic like sound which I wasn't too keen on.
Then fitted a set of string savers with the teflon and I liked them a lot more...same sort of extra brightness and sustain but with a more Sraty sound ...if you know what I mean.
I was thinking of trying a tune-o-matic set on my LP copy to see if they are an improvement on the retro fitted roller saddles. Either that or a set of rather expensive titanium saddles....so I'd be interested to hear what you think of whichever graphtech type you decide to go for.
Cheers