Tried the Nording keystones twice now. Once in a 9mm filtered cob and once in a 9mm filtered Vauen. My take - aways so far are positive. I’m an aro smoker largely, and don’t often dry out my tobacco.
First try I got no dottle but a little tongue bite even with the 9mm filter. Second time, no tongue bite but again no dottle. Just took the first time to adjust to the new more open draw etc I guess.
After two smokes, stones still the same colour as they were initially. Gonna monitor how many smokes before they blacken.
With 50grams of pipe tobacco costing between $50-$75 CAD, seeing no wasted tobacco at the end of the pipe resulted in a pretty big smile.
Even though getting a bulk bag costs almost $40 CAD with shipping compared to the $13 USD, the tobacco savings should offset the cost.
Just my 2 cents so far.