I really like Tnet3, I starting making a MMO, Right now I have a simple attack system, player movements and player information using the network, each player are using only 1kb, and that is amazing because with just 25 mgs you can get more than 1k of players. I'm using the amazon service for the server hosting with no problems.
If you want I can make some tutorials about how use Tnet with Playmaker, also I have made more actions and some problems are now fixed.