Feature:
It fits perfectly with a Roland 210 or 115, no idea about other amps/cabs. Slight irritation that you have to remove castors from whatever cab sits on top.

Quality:
Excellent, built like the proverbial brick ****-house, and looks the part too.

Value:
Tricky - not sure I'd pay retail price for it, though it sounds better than others of comparable price.

Desirability:
Don't ask why - it just looks & sounds so good.

Sound:
Fills in the missing deep-bass that the 210 lacks. Bit of a resonance around A to C (countered with tone controls but this removes the edge from the 210 that I use it with). otherwise, impressive for a relatively light/small unit.

Ease of Use:
Simple audio cable - no worries with using speaker wires - works great on other side of stage so guitarist can hear me and spreads the sound nicely.

Support:
Not really dealt wth Roland before trialings amps and their 210 came out tops for value/money.

Overall:
All in all, performance for it's size, weight & portability is excellent and admirably fills that gap for large halls.