In reply to MJDM:
Good question, and in retrospect this is something I should have covered within the review. In fact, I'll get it added now.
It's been a long time since I last used the Dragon, and I've never used the Blackwing or Qubit, so will keep my observations fairly broad. Visually it does bear resemblance to the Dragon, but I don't think it's anywhere near as tensioned as that was, but like I say - it's been a long time since I last used them (and I don't have any left kicking around to compare them to) so I might be wrong.
The heel on the Flat is neither particularly wide or narrow, sitting somewhere in the middle in terms of volume. I have a bit of dead space on the bottom, but I do have quite a bulbous heel, so that's hardly surprising. I've not had any issues with performance and if there is a heel hook I couldn't use then the blame would firmly be on me and not the shoe!!
Next time I'm out with Tim, who reviewed the Quibit, I'll try and get a photo of the two side by side to compare.