Congratulations, I bought basically the same system in August (4 jaw instead of 3 jaw chuck) and I believe that Shred also has the same machine.
It has proven to be easy to program, operate and very accurate. I have just started cutting gears using the Gearotic Software on the fourth axis. This is a Gear Shaving Program and it works very well for large pitch gears (16DP+) including Helicals and Knuckle Gears. For the RG gears however, while it would theretically work the cutter diameter will be very small and the operation slow. May try it anyway.
Some of the other Tormach accessories that have proved to be handy is their Jog/Shuttle Controller, the 3/4\" collet that fits the center of the 4th axis and the TTS Tool Holders.
nitewatchman