Yes I really dig this ship. Asides Cangel my favourite of the show.
Like people before already said, I thought it made for Wesley's most interesting time on the show.
This couple had this kind of really attractive darkness to it. It started out of sort of hurt and depression (Wesley just having been estranged by his friends) and turned into much more, although they both weren't readily admitting that. I am convinced, however, that on some level they both loved each other.
This type of sleeping-with-the-enemy ship just touches something other ships can't. I think it's the fact that the people are supposed to hate each other, but something happens that makes them overcome that. Very hot.