My name's Tom and I play Portal 2 maps, put the vid online so you can get a first hand feedback. You see how your map is played by someone who hasn't seen it before. Usually, I upload the blind play. But if it takes too long, I just upload a replay of the map.
Sometimes I give feedback at the end, noclipping around and pointing things out, and sometimes I don't.
But I'm not solo only ;) Tom + Skhar go for your coop maps! Feel free to submit!