There's really nothing bad to say about these. they're comfortable, the cableknit provides the cling so no tight binding at top or bottom, they're long enough to fold over for double layer warmth and still cover the entire leg. I use them to ward off aches from cold weather, and they really work well for me. I imagine they'd work just as well for dance purposes.

Update Aug. 29, 2015: I have owned these for roughly 6 years now, and they've held up incredibly well. They haven't stretched out of shape, despite my habit of folding them to double or triple thickness to center over my knees when the aches are worse than normal. I wear them often in the winter, and wash them about weekly (averaged out) and they haven't shrunk, frayed, raveled or become damaged. After all this time and all the wear and tear, they still look, feel and fit like new.