I watched it online. Ronnie and Beckanne are the only ones I can tell apart. The rest all look the same, with their angular faces and pointy noses, and then the brothers with their unibrows.
I'm watching and am enjoying it so far, though like PP I'm still having trouble telling a few of the dancer a part. The show has managed to catch the little kid part of me that is all "Oooh, ballerinas!" so I'm not minding some of the forced drama so much.