Join the dbstalk.com forum and look at the "Cutting Edge" subsection. You'll find out everything you want to know about MRV. I do not have the required configuration so it is not a feature I have paid much attention to. I think that, at the moment, you can "play" a remote show only on a H2x (non-DVR) and it is a streaming view, not a copy like TiVo. DVR to DVR viewing is said to be in the works.
I have used the streaming to and from PC and that works well.