Mitchell Waters at Curtis Brown
Curtis Brown US is smaller than Curtis Brown UK, and they are totally distinct and separate. (I don't know how they have the same name, I'm assuming it was like the split of the Roman Empire.)
CB in the US is smaller, but it's still a big deal. They consistently make seven-figure deals, and they have a huge client list, so only a fool turns their nose up at them.
I sent Mitchell Waters a query, got a reply 30 minutes later. Swapped a couple of emails over the next few minutes, then sent him the full MS after he requested it.
He sort of sat on it for about two weeks, until I sent him an email telling him that I was getting interest in my MS from other agents, which I was. (Never bluff in agent-hunting: Your bluff is bound to be called.)
The book wasn't for him—but he asked to slip it to a colleague of his at Curtis Brown, whom he said might have a better affinity for my genre of work. I agreed, and he said that he'd forwarded it to his colleague.
Like any agent, he's got a lot on his plate. And like all agents, he will only pay attention to an MS if he perceives other agents are also interested. But I appreciated the fact that, even though my MS wasn't for him, he thought it might be for a colleague. Most agents just brush you off if they reject your work, but Mitchell clearly wanted to help the writer.
So very nice guy in my book.