I had previously installed a Duraplus Chimney 20yrs. ago and while replacing my roof shingles this fall I decided to replace the old chimney as well. I have never had any problems with the old chimney and we use it sometimes 5 months out of the year.
We do brush it out twice to three times when using it, and also add creosote remover to the fire at least once a week.
I would recommend this pipe to anyone looking for a superior product.