Well, @braindoc beat me to the punch this time. I got my long probe installed on Mother's Day so I could cook a tri-tip for the family. It took a little twiddling to get the GGG connected to WiFi, and then my (1st gen) Predictive Thermometer to pair with the GGG. Also, I was surprised that after four months there weren't any firmware updates for the GGG, but if it ain't broke...
It was a bit of a gamble since I used to use a BBQ Guru and would set the pit probe on top of the foil-blocked portion of the lower grate to get a "pit temp" of 225, so I had no idea what that'd correlate to between the GGG temp and the ambient temp on the PT. I ended up with about a 160 degree spread between the two. With the ambient on the PT starting around 125 degrees and slowly climbing to 170 degrees the cook finished just slightly earlier than I expected, but still turned out quite tasty.
I'm satisfied with the longer probe and happy that I finally have a useable temperature monitoring solution from Combustion. Now if they'll ship the Combustion Engine I paid for nearly two years ago I'll finally have a complete replacement for the BBQ Guru!
ETA photo