I've got a 8ohm 2006 Avatar Vintage cab, which was their top of the line model at the time. It looks just like a standard Bogner cab. Sounds excellent! I'd say it sounds just as good as my Mesa recto cab, just different.
One thing I will say though is. If you get one of their 4x12's ever, the brace that goes against the back panel is not screwed down, so that back panel can have a noisy vibration whenever you play loud palm mutes, so I went and screwed that brace to the back panel and that fixed the issue.
I also owned the standard 2x12 avatar cab for a while, but sold it. I just can't use a 2x12 after playing thru a 4x12 for so long, they sound too small and kinda boxy to me. I could never really crank my amps thru a 2x12 either, it just gets too much of that boxiness and speaker distortion happening at loud volumes. I need a 4x12 when playing loud.