"I think the shimmy issues were due to Soma selling the bike as a touring
bike and a small few riders rear loading it with heavy loads. Production
steel low-trail bikes don't really have the ingredients to shimmy for most
riders unless the rack or fenders are poorly mounted."
^ This is incorrect IME. I had a 55cm v1, fitted with a Stronglight Delta needle bearing headset from new after everything was faced to ensure correct alignment. Rear panniers were never used, only fronts. Despite this it shimmied consistently every time the speed reached ~28-30km/h. If a bump was hit mid-corner things were much worse, and there was one very scary incident descending a pass in Wales in rain and mist with high speed passing traffic where things escalated to tank-slapper proportions. I could never relax on the bike and just ride it - until a new fork with 14mm less offset was built. After that, shimmy was no longer endemic, but there was still one unpleasant incident during PBP 2015 on a wet, twisty descent.
I also found it extremely difficult to follow a straight line, like for instance a road border or someone's wheel in a paceline; instead the bike would wander. I'd never previously had similar problems on any other bike - road, touring or mountain, although some small wheel bikes (like AMs) ween't notably directionally stable.
QC was also rather dubious IMO. The frame I bought was supposed to have a 72.5° HTA and 69mm offset, but in reality it was 72.0-72.1° and the offset was 74mm (measured on Anvil frame and fork jigs). Some of the canti boss brazing on the fork was rough too, but fortunately nothing actually came off.
Caveat emptor,
Stephen