AAMOF, I just had to get a second user ID here for my ego! :rollover
Actually, I don't know how good my answer will be, 'cuz I'm not personally much of a compressor guy. Almost never use one myself, and I don't own one of the 5-knobs, though I've made several for customers. Can't really comment on the boutique comps, since I haven't played 'em or researched them at all. Sorry to be such a bastion of ignorance on this effect!
What I can tell you is that the BYOC 5-knob kit is basically the classic Ross "Gray" compressor circuit modified to allow much greater control of how the pedal works. It's a nice clean, quiet compressor from what I've heard during build checkouts. Seems to do everything a compressor is supposed to do, at least to my unpracticed ear.
As far as performance goes, I'd defer to somebody who has one and uses it regularly. A Fret.net regular who bought one from me is Hubberjub. Maybe he'll stop by & comment....