The Graph Tech LB63 with Ghost piezo saddles is a solid piece of equipment. In terms of Floyd Rose drop-in replacements, it is more reminiscent of a squared-off Gotoh GE1996T than a Schaller Lockmeister or an Original FR bridge, but certainly doesn't suffer as a result. It is smooth, well-built, and equipped with a nice brass trem block (not some horrendous pot metal thing like so many licensed FR trems are supplied with).
The springs and claw are excellent quality as well, and for this installation did not require replacement.
The saddles feature Graph Tech string-saver material at the contact point where the piezo crystals are embedded, and in terms of looks they are actually very nice and not intrusive.
In terms of sound and performance, though, the LB63 is excellent. The piezo aspect functions perfectly, even when going crazy with divebombs (divebombing an acoustic sound is weird, but strangely satisfying). There are no drop-outs or cut-outs, even when the strings are completely loose.
As a choice for a custom build, the LB63 is excellent, as you have to adjust the bridge placement by a few millimeters. On a drop-in replacement operation, things are a little bit more complicated, requiring some considerable time adjusting the intonation. The instructions that came with the LB63 were adequate (barely), but certainly could be improved and updated with information that is provided on the Graph Tech website - if you purchase this, check through the FAQs and support sections there before attempting an install (custom or drop-in). It also focussed more upon the installation of a Ghost system as a whole (in a basic overview format) than the installation of the LB63 itself. Additionally, the instruction sheet looked like a photocopy from a copy of a copy of the original, and the diagrams were rather small. Given that the manual that comes with the actual Acoustiphonic or Hexpander is a nicely produced item (although, again, rather small), this single sheet was an unexpected negative.
The only weak point in relation to the trem itself is the trem arm - it does not tighten up very well at all, and swings loose. Replacing this with a Schaller trem arm solved the problem, but given the quality of the rest of the trem, and the overall price mark, this was a disappointment.
I would certainly recommend this trem over buying the piezo saddles separately and attempting to modify the base plate, as it is of good quality, is preassembled, and is difficult to go wrong with (unless you are using it as a replacement on an instrument where the initial placement of the trem makes intonation impossible consult the Graph Tech website before attempting installation. Careful measurement in advance will save you a lot of time later on).
I would have awarded 5 stars rather than 4 for quality if the trem arm had been of the same quality as the rest of the trem. While the manual/instructions could have been improved, the availability of information on the Graph Tech website negated this niggle. Overall, though, the LB63 functions perfectly, particularly in the main reason one would purchase it: the piezo capabilities.