I had 6" insulated stainless liner installed the day after Thanksgiving 2014. I have a Buck Stove insert, non cat. I had the pipe "brushed" the day after Thanksgiving this year. I burn only seasoned wood, and I burn hot fires. I even bought the magnetic flush mount thermometer and the "pistol" IT to make sure I'm doing it right. I might have gotten a double handful of "crumbs" out of my pipe last Friday, which I think is good. I used a lot of good info from this site. However, I am still a little gun-shy on chimney fires & a runaway fire. One time last year, on a load of very small, dry splits, it got to 700 degrees, and I did get a little spooked. I keep telling myself, as far as chimney fires go, that if the pipe is clean, that means there is nothing up there to catch on fire. I guess I am looking for a little re-assurement that I'm doing it right, before my first fire tonight.