The Goliath III is a pretty standard 4x10 (8 Ohm speaker). It's punchy but full and warm. It works great with whatever amp I use to feed it. If I could only have one cab, this would be the one. It can handle enough power on its own to be a one-and-only cabinet in a decently loud band.
I have a decent amount of SWR gear. The sound is quick and clear, giving all the note definition I want while still being warm enough to give good feelings. It's not sterile or overly bright.
A friend used it and another cab (4x8) and my SM500 amp for a number of live shows with his band (his sound is sort of old school Stu Hamm) and it sounded amazing in the mix. The Kubicki he rocks sounded very good in the crowd. Big and full but still cut to give the crowd the details of his notes and harmonics.
It is heavy, though. Maybe a Neo cab would be a good idea were I playing out. It's pretty tough to move by myself, esp. in cramped spaces.
I bought mine used at a guitar store for $300 or so. Well-worth it, IMO.
Pros - -Awesome modern super clean massive sound
-Slap tone heaven
Cons - -Heavy
I'm a long time user of SWR 410 cabs (more than 10 years). Compared to many other cabs, I feel the SWR have something special. Clean, massive lows, super punch. The closest I had was the Ampeg 610 HLF.
It's still a bit heavy, but to me, one of the best 410 ever. Compared to the Mesa 410 PowerHouse, I felt the PH was a bit too aggressive. While the SWR was as efficient, but cleaner and smoother.