[Twisted-Python] Reliable Datagram Protocol?

[Chaz.]

I have need for a reliable datagram protocol running under Twisted. So 
far I have found AirHook (2003) and an RDP implementation that was 
posted on p2p-hackers (2004). I have also found Divmod's Vertex.

I was wondering if anyone has had any experience with any of these 
implementations? Has anyone heard of any other RDP implementation?

Peace,
Chaz