Had mine almost 15 years now. Rebuilt maybe 6 years ago, the gear change pad is splitting now but still they don't leak.
TransTourman was launched 2019 AFAIK? Can I borrow your time machine? There's a few things I need to go back to sort out...
I've had mine a few months now. Not as comfy out of the box as my Gaerne GX-1 Evo or my Acerbis X-Team, but grand now.
Just as heavy as a motocross boot, a bit more flexible, fit large, completely waterproof in multiple rides in torrential rain, replaceable arch is already showing wear, but my GS does have Pivot Pegz without the rubber caps on them.
I imagine there are cheaper boots that are waterproof.
I also considered the Rev'it Expedition, and am still unsure whether I'd have been happier with those.
Not at all disappointed with my TransTourmans, but not cheap.
I got mine for €480 from FC-Moto.