I've been using my Dammerr with great efficiency, so much so that I've left the BD out of my kit. As along as I maintain a snug, but loose grip and maintain the aim, I can get a bolt in fast even when tired otherwise. To be honest, as I've been thinking about how poorly my grip was on my BD, it really is a zen-like concentration that is required to not otherwise drift into 'oh a little rest la la land' which devolves into a 30 minute hole.
From a bad stance, the longer shaft takes getting used to after years of BD.
Thx for making the Dammerr!