I think there are a lot of skeptics regarding whether something like this is of benefit, so please keep us posted after use it if you find that it is actually beneficial.
I believe that if you plumb yours in where Jody did (between the machine solenoid and the flow control valve in the flowmeter), the extra volume it adds there is probably going to increase the amount of argon that suddenly gets wasted out the TIG nozzle ("whoosh!") each time the gas solenoid opens. This could cause a noticeable increase your shielding gas consumption.
'13 Everlast 255EXT
'07 Everlast Super200P