I just used a Sooteater to clean my chimney liner for the first time and I am pretty pleased with the result. I have a 27' tall 6" SS flex liner going down to my 1st floor Woodstock Fireview install. After one season of burning my first cleaning yielded about 10 cups of incredibly lightweight brown coffee ground-like fluff. Out of curiosity I weighed it on my kitchen scale and it weighed ~9oz. This was really light stuff. So, check this math -- a 27' six inch liner has about 6,107 square inches of surface area. 10 cups of powder is about 153 cubic inches, which, when spread over the whole surface, would be about 0.025 inches thick -- which is less than 1/32 of an inch. So, I figure, on average, I had less than 1/32 of an inch of buildup in the flue. Which doesn't seem that bad, especially given that it was all the fluffy kind of buildup. Anyway, here's some tips on using the Sooteater. I have a steep slate roof and am afraid of heights so cleaning from the top is a no-go. So, to clean from the bottom I bought two complete sooteater setups so that I would have enough flex rod to reach the top (each set comes with 18' of rod). Tip #1: the night before I cleaned the chimney I duct-taped one of those glow-sticks to the top of a rod section and kept feeding sections into the chimney until someone from the outside could see the glow-stick shining through the spark screen. Then I marked the bottom rod so I would know exactly when to stop the next day before I hit the top. Tip #1b: for the love of all that's holy DON'T let go of 27' of flex rod while it is up your chimney. I made that mistake. Quick as lightning 27' of flex rod shot out of my chimney like a snake and slammed into the opposite wall. No damage to the wall, thankfully, but the metal parts of the rod sections did chip the edge of stone fireplace surround as they flew over the edge. Minor damage that is hard to notice from a distance, so I'll just chalk that up to a life-lesson. Tip #2: the instructions call for some complicated setup where you tape off your fireplace opening with sheet plastic to keep the soot and ash down. That seemed like a pain in the butt, plus you'd need to vacuum that stuff up from your fireplace anyway which is also pretty dusty. So, you know those thin filmy bags that mattresses and electronics often get shipped in? They look to me like natural filter bags. So I grabbed one of those, took it to my wife's sewing machine, and sewed it into a long "sock" shape with about a 6" diameter and one closed end. I put a piece of duct tape on the outside of the bag about halfway down and cut a slit in it to pass the rods through. In this way I could bungee cord the sock to the pipe, feed the rods through the slit, and all the stuff would just fall into this filter sock. It worked pretty well. Pictures attached. I used my 5.4 amp corded drill. It worked fine for all 27'. Almost all of the soot fell into my filter bag.