Let's be frank This is a benchmark amp.
It has one channel, only the 'high' input will really get used (unless you use active pickups), it doesn't have endless amounts of gain, there are plenty of better choices for cleans, there's no built-in reverb or other fluff. This is an amp that does one thing, but does it so well that you won't really care.
What is that thing? Connect it to a 4x12, plug in a Les Paul, keep that pre-amp volume above 8 and the master around 3 or 4, smash that A chord and feel like the rock god you always dreamed of being.
Purists might sneer at the effects loop (don't use it then). Some will whine about the single channel (put an SD-1 in front of it and learn to use your volume control). Put simply, this is an amp that isn't built for jazz, dream pop or being contained in your small, city apartment (as my neighbours will tell you). It's meant to move massive amounts of air and melt the faces of everyone, including those in the nosebleed seats on the far side of the arena.
If you love the 800 roar, have never heard the word 'compromise', feel squeamish at the prices on the vintage market for something that'll very likely need a rebuild and are totally okay with tinnitus, here's the original (reissued).