In reply to Gone:
First impressions: I thought it was generally good. It's expensive - like, in the same ballpark as the big London roped walls for a medium-sized bouldering venue - but apart from carping about my personal preferences for wall-angles[1], I can't think of that much that they could have done better with the building that they've got.
Compared to KK there's more space, better music and generally more climber-friendly vibes. They also do shoe hire, which is going to be a massive bonus for clubs and groups.
The routes were good, but I generally find the setting interesting at KK too.
Overall, it's good but I'm not sure how well it justifies the (significant) price premium over KK - I'll probably keep going to both for the variety, but I think in the long run, where I end up most will depend on how busy each one ends up being.
[1] okay - a bit more variety of angles, particularly some sort of cave, might have been nice.