Unfortunately there is a big cloud over BitMit in the moment as to exactly who owns it, and who has control over escrowed funds. BitMit don't appear to be interested in trying to clear this up either. How can you trust an escrow service if you don't know who runs it?

This is discussed in a number of threads on bitcointalk, for example:

https://bitcointalk.org/index.php?topic=135366.0