I agree. These work really well, except in tight spaces. I've been using it to clean up our CS690s in the mornings and it gets a little clunky going under the chute and in the accumulator. Filtered the air great and kept my face clean. We bought a couple for the farm to clean up equipment with and a couple for our elevator for when they have to go in the barns and tanks to clean.
Also, it works good to get some funny looks from people where masks are required to enter.