I had it done at my house and probably would not do it again. The reason I did it was to remove construction debris and dirt that I felt needed to be removed. After actually seeing what was removed I felt it was a waste of time and money.
Unless you know for certain you have some kind of problem within your ducts, I wouldn't waste your money doing it...
Just my thoughts.
Dan
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It's Always Sunny On Welch Island!! 
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