I'd stay away from the cold smoker. I have the proq cold smoker, which is a similar design, and it's finicky with the dust you use. I got so frustrated with it in the last cook that I bought an amazeN pellet smoker.
PBE I was thinking about the cold smoker from proq - is it really that bad? Something wrong with the design or dust quality?
I think it's a combination of both. I believe the mesh material they use doesn't flow air that well so it's very finicky with the dust particle size/species. The channel cross section on the original proq are also quite small so the risk of burnout is higher. However, when it does work properly with dust it can smoke for a long time. Other reviews online seem to have similar experiences. Frankly, I don't care to experiment with this cold smoker anymore when I'm smoking meat that costs alot of money and time to prep. *note- I process my own dust from pellets. Dust is pricier and more difficult to source locally.
I can run some tests with the AMPS and ProQ with pellets if there is interest.