Picture the graphite nut as a lubed up regular nut without the lube goo mess. The tone I thought was surprisingly good. I would never hesitate to order one.
The LSR roller nut is a whole other animal. IMO, it is great. The open notes are clear with lots of sustain because the string vibration terminates on metal.....like your fretted notes. Mine worked flawlessly and was a breeze to install after the Warmoth LSR nut prep. Never had string binding that's for sure. I look forward to spec'ing it again if the opportunity arises.
Yep, I've also got one of each. If I was putting a trem on the guitar I would use the LSR without hesitation. Sound is quite excellent and combined with locking tuners it provides for great tuning stability. Obviously overkill on a hardtail so there I would go with the graphite.
The only thing I've heard bad about LSR is that they're finicky about string gauges, 009's or .010's is it - they freak out on 12-58's for downtuners. I'm not even sure if this is true.... :icon_tongue:
As always, it depends upon your vibrato bar use/abuse. For heavy use, nothing stays in tune like a locknut. In my experience, a LSR with a set of locking tuners (staggered tuners are a MUST) is very dependable for light to medium use. Graph Tech nuts are great too, but not as dependable for tuning stability, even with light use.