Mine really sounds good. I use it for very specific tones (80s metal) but can have endless tones within. I do not have any pedals up front but do keep a Roland SDE3000 between the preamp and amp. I also use it as a dB boost which is nice as it can change on the fly for solos. There was a rack mounted head maybe 2-3 months ago? I posted it here and I recall it being about 4500 bucks. Sold quick. The rack stuff is uncommon so people want it. Had I not had my Caswell and SLO poweramp I would have considered offering on the rack head recently maybe but I’m gassing other shit now. The 77 version I cannot speak to.
In summary: I can’t imagine ever letting this combo go.. it’s really really nice for me