I've used the 8 ohm version of this cab for three gigs now and have gotten a pretty good feel for it. Front end is a Demeter pre into a Crown xti 1000.
I think the previous reviews have been very accurate. The sound is deep but lively. This particular group does a little of everything from blues, funk, soul, to AC/DC. I'm not a pedal guy at all. Keeping the tweeter control at about 25% I've had no problem going from smooth and round tone to growly to slappy by merely rolling up and down a bit on the treble on the my bass. Thump factor is very good too.
Played one small place with a tiny stage and filled it easily with no FOH. On an oddly deep but narrow stage, I found my cab way out in front of the drummer. Rather than mess with running through his monitor, I just stuck a hartke 2x10 cab behind the Avatar pointing back at him. Running the Avatar at 4 ohm resulted in a slightly more "forward" sound but with the same deep tone.
I may put some casters on it, cause I'm just lazy that way, but as it is this cab is 30 lbs lighter than my Ampeg 410 and pretty close volume wise. Seems to not even blink at throwing lots of watts at it. I don't think you can go wrong on this one. Great bang for the buck. The cover is nice and a no brainer for $30. If you're nervous of the idea of the "hi-fi" sound that's been mentioned, don't be. This cab seems easily capable of a wide range of tones with little effort, and is exceptionally versatile. I at least, am very pleased and look forward to getting to know this cab a bit better.