I built it (and the G4) with Buggs pcb (last revision, with 4 72s).
Less gain that I would expect considering youtube videos, this could be my guitar (medium output HB) or the fact that I play it in front of my amp (tweed, no fx loop), but still enough to play heavy stuff.
Anyway, very easy build and sounds great, a very well defined distortion with a lot of clarity, from early ACDC to 90's metal.
A bit more gain on the G4, and different voicing, more modern
Both are keepers
(On the G3, agression on red I have some squeal with gain over 2 o clock. If I put a buffer before, no more sqeal. No sqeal at all with the G4, no matter the setting)
G3-1G3-2