I read a lot of homestar reviews, called the top three ranked cleaners and chose this firm. I was getting a new furnace and hadn't left much time for a duct cleaning. Joe, the owner was very helpful on the phone. But what cinched it for me was that at the end of the call he said he would appreciate my business. Asking for the sale seems like a basic business thing to do but no one else did it. It worked and he got my business.
Will came out and did the cleaning and it was very thorough. I followed along and he explained everything. Even though I was replacing my furnace two days later he did a thorough furnace cleaning on my old beast of a furnace so that the soot and crap in it didn't undo all the duct cleaning he had done. This proved especially helpful for the furnace install team a few days later as they had to take the old furnace apart to get it out. If it had been full of soot it would have been a mess.
I like this firm and recommend them.