A while back there was a thread where there was a decent argument going on between Rich and this guy musikron who used to post here regarding fret falloff/fall away:
Rich is obviously not a proponent of this while musikron is.
Well some time back I sent my Jem FP neck to musikron. It was suffering from scarf joint shrinkage and he said he could fix it. He actually did a fantastic job fixing the neck and now it plays great. I have to leave a little more relief in it than I normally would, but it's still a great neck.
Anyway, I was just checking the setup on this guitar the other day and I noticed that he had cut some falloff into frets 21-24. Basically, the neck is completely flat in that area and the frets are dead level, but then 21 is slightly lower than 20, 22 slightly lower than 21, etc.
Honestly, I really like the frets done this way. I've noticed that this guitar sustains better and plays cleaner above the 12th fret, particularly on bends and I'm now sure this is why. The strings aren't fretting out on the last couple frets, which they have a tendency to do because there's no bow in the neck in that range.
It definitely makes the setup a little more complicated, since you have to account for the falloff in order to set string action and neck relief properly, but count me as a fan of this.
PS: this is not an endorsement for musikron. He did fantastic work on my FP neck, so I later sent him two other necks to work on. He had those necks for months, made excuses about delays, then charged me for work he didn't do. I later paid Rich to do the work musikron claimed to do on a JC neck.
Worst of all, I had dropped the necks off personally while on a business trip, in a box that was good enough to protect the necks but not suitable for shipping. When he shipped the necks back, he didn't re-box them (which I insisted on). One of the two necks was damaged in shipping (thankfully only cosmetically) and when I contacted him about it, I was of course completely ignored. DO NOT DO ANY BUSINESS WITH THIS DIRTBAG.