The official answer seems to be no. The anecdotal answer (via Google hits) seems to be yes. I'm in a situation where QAM tuning would be very desirable and cost-effective for me.

I've got an MCE box going, and the only reason I've been holding off on making the switch to Myth is the damnable QAM dilemma. I know there are better/*more* compatable QAM-capable cards than the A180 out there, but the price point is the only thing even making it possible for me.

Thanks in advance for any concrete answers.

it works ok for QAM
and I believe since it's cable signal, the sensitivity of tuner chip does not have too much effect here.
I can get all clear QAM channels using A180