If that is of any help, the latest alpha builds
http://shareaza.sourceforge.net/?id=debug seem to connect effectively to the G2 network.
After about 2 hours of testing with build R8945 everything seems in proper functioning order.
Although the initial connection took about 3 to 5 minutes, everything appears to work well after that, connection is fairly quick after restarts and hubs are holding well.
I selected the "reset discovery service" option on install. (It might or might not have been a factor)
I did not test G1 connection as i never use that network. In my opinion G1 support should be removed but that's another topic.