we where told we needed an MRX-1, not the case, mostly, IP is a little lacking in some areas though, it won't work with a JVC projector due to the handshake, actually we can get it to work from the pc with the MX tethered, but when disconnected it fails.  I think many people just do not use or understand IP yet.  We took all the networking classes online URC offers and it helped somewhat, but it still seems to need some work to be ready for primetime on IP.  Another one is some Sony DVD players, due to device registration we cn't get it to work.  We are controling both with Roomie over IP so it can be done.