Product review (5 stars): Easy and Cheaper Than Paying Someone Else
This is very easy to use and straight forward and much cheaper than hiring someone to do the job.  I actually initially hired someone (an off-duty firefighter, $50 for the service) to come clean my dryer vent, and he used something exactly like this.  After he came, I ordered one myself so that I could clean it on my own.  Love it.