I would like to recommend Faber chimney, I have oneglassy chimney and it works really well. Having read other discouraging reivews from others I feel sad for them, but in my experience this product has turned out to be a very robust, maintenance free and ease of use. I generally purchase product of those brands in which they specialize, so Faber specializes in chimney, thus this was my obvious choice to gift my wife and believe me, she is still happy with this product. The service is a bit slow but they respond within a day or two. Go for it.
Saurabh/Bangalore