New cable came in the post this morning so I've had a bit of a play with it with an Ampeg PF20 and bass. First thing I noticed is how efficient it is compared to the cabinet I use most, which is an old 1516 diesel cabinet. It goes deafeningly loud with volume about half way up.
Second thing I noticed is that there is much less hum coming through than with the other cabinet - Ive always found the Ampeg a bit poor in the hum department, but its much better with the this cab. I don't know why this would be. Maybe I was using a better socket.
Next I noticed I needed to file my nails; there is a LOT of high frequency information available if you want it. Its very clear and natural though. Bass was hard to judge, as the room didnt like low frequencies very much. The floor was shaking at quite low volumes. It clearly goes very low if you want it to.
It seems to respond very quickly and predictably to tone controls as well - the PF20 is definitely a good match to it. And I really I can't imagine many situations where you'd need more power. High efficiency is a nice and unexpected bonus, I think lots of low powered amps will give you all the volume you need with this cabinet.
Impressed so far. I'll try it with an electric piano when my daughter comes in from school - thats what I built it for really