After reading a recent thread on this device it has me thinking of cleaning my own chimney instead of paying a chimney sweep. I have a few questions though. I was looking at the pics on the recent thread and it seemed a lot of people have a round flue. I have an open fireplace and it has a square flue, I'm thinking maybe 9 by 9 or 10 by 10. Will this work on a square flue or is it designed to be used strictly on a round pipe. I am interested in this because I'm afraid to get on top of my chimney and it looks like I could do this from the inside. For those of you who have them are you pleased with the results your getting? Is there any other options or similar devices out there to consider? Or just pay a chimney sweep and forget it. I just want to make sure I'm getting a clean chimney as I don't like surprises. Thanks for your help