I don't have the Floyd version, but I do have Earvanas on several guitars and they work extremely well.I have an Earvana on a couple of my guitars and it makes a difference that I can hear.
A good one. YMMV.
No experience with the locking one, seems like good materials & workmanship...
I have the floyd one, it's great
They should try to make them less expensive though
There was one installed on a Jackson (string through body) archtop soloist I bought used. I could not get the guitar to stay in tune. Not way out but always just a touch out of tune. I had Dan Erlewine remove it and put on a regular tusq nut and now it's fine. This is my only experience with them.
Wait a minute... a Earvana Floyd Nut was originally placed on a non-locking tremolo guitar?