Just back from Santigosa where there were a number of Vertigos in action. Dougies and Dabills bikes were much louder than the others but certainly didn't seem to lack power. Development seems to be on going as looking at each bike there were different set ups being tried in terms of exhausts , yokes hydraulics etc.

Overall I was impressed with them

Maybe my first NEW !!! trials bike ...

Only ever heard Dabills, and personally i think it sounds terrible. Like an old greeves or something

At low revs I agree it sounds awful but pulls better than it sounds.Sounds completely different and better when revving higher.it flattened the climbs in Butser at the BTC