Had a B&M setup off a Shimano dyno hub -- Lumotech IQ Fly with a taillight. I'd say the B&M stuff is amazing value for the price, and wouldn't hesitate to run an IQ Cyo front.

But I splurged on a Supernova E3 Pro setup. Wicked happy with it, but not sure it provides such better light that it totally justifies the price. Compared to the B&M stuff. Or maybe it's just one of those points of diminishing returns vs money spent, like weight weenies shaving grams.

Point being, the B&M line is amazing value. Supernova sure don't suck, though.