I've got the Transcontinential and just got back from my first loaded test ride. 3 days on gravel, singletrack and tarmac.
The stability is impressive, so is the ride comfort and speed. The Fatboy tires are not meant for anything but tarmac, but it was a fun challenge

My only issue is the rocker drop outs, which makes the belt tensioning a pain.
Also, the cable for the rear light snapped in shipping, and Supernova has not made it easy to replace.

I got the DLX version for my girlfriend and really dig that as well, though the Sora shifters are a bad choice for 42cm or less handlebars on a touring bike.
An Ortlieb handlebar bag is having a bad time with the gear cables, so if you can make a deal with your LBS for a 105 shifter upgrade - do it!