They're absolutely worth the money, if you have the extra dough!
don't forget to figure in the added cost of cutting the grooves in the saddles and installation, if you can't do that yourself.
It's trickier than it looks, especially filing the grooves.
I got sick and tired of the PRS McCarty stoptail piece on my
teal black McCarty. They designed it to intonate with 9's or 10's
in standard tuning, ONLY. I use 11's, tuned down a halfstep w/
a dropped low E, on that guitar, so I HAD to get an adjustable
tailpiece, or the guitar wouldn't intonate perfectly.
I love it. Now, the guitar intonates perfectly w/no sour notes anywhere! Also the sustain and boldness of notes got much better. The only negative, besides the price, was a little bit of added brightness. All I can say is that my McCarty with Tonepros
and zebra C-5/59 is one of the best sounding guitars I have.
That combination has elevated my PRS to the level of a Gibson, tonally.