Sorry, I'm a bit late, but I thought it best to post nonetheless. I picked up 2x the black edition cards when they first launched. They replaced a pair of PNY 770 4gb OC2s. I've not had any problems with them, and from my recollection of my research, they have the best designed power design in its price range and ABSOLUTELY NO cable whine (there may be other cards that can claim this now, but at thee time this was the only one. I've not had a computer crash related to my cards despite frequent gaming and CUDA rendering in Blender. I'm not experienced in OCing GPUs, so they've been left at stock speeds.
TL/DR I bought these because:
No cable whine (only card at the time)
Best power phase design (at the time)
Pin layout matched the cards they replaced
Back-plate = better stability.