Makes me want to start sending out so I can get rejected at to...
caution :-) On a website I found out that one agent was looking for a large historic novel. As a whim, I sent it off with my three sci fi queries I was sending to agents. I got bounced back quickly on the sci fi. The rejection on the monster historic novel took forever! I sweated it daily ,as the work is a huge chaotic mess that is so far from sending out. The longer it got, the shorter I chewed my nails.
Thankfully a great deal later, I got the rejection letter I expected all along. It was lovely and they told me that they had decided to go with a published author wanting to break into a new field. The sweat and worry wasn't worth it. Plus I felt that I was misrepresenting myself and my work to the agent. I vowed to never, ever send a query on a whim for something that I'd be embarrased to send in if requested..
So send in, but beware they might actually want to SEE it! It would be horrid to get a request and then look unprofessional by explaining it wasn't ready. :-)