Used Yellowstone on a recent trip. On time, knowledgeable and tidy. Couldn't even tell they were there afterwards, even with the amount is soot they pulled from the fireplace. Interesting equipment (I'm kinda a gadget junky). Was a little more high tech than what I expected from a chimney sweep. Service included a fireplace inspection plus he gave us tips on how to burn wood cleaner in our fireplace. Nice guy. Highly recommended. read more