I have a TSU9600 with and RFX9400.

1. Communication is instantaneous - there is no waiting
for a connection.
2. There is no blasting - you have to use stick on emitters.
It comes with 2 dual emitters which can control 4 devices.
It can take 4 dual emitters for 8 devices. However, I
believe you can buy Xantech components to take it beyond
8 devices.
3. Your existing NG is plain RF; the RFX9400 is WiFi -
they cannot talk to each other.