My experience, they work ok for a short while, then not so good. Buy a Stihl, Echo or Husky from a dealer. Great service and they will help if you have a problem.
I have had the same problem with porch coves and lean-to's. I found if I can put decking under the metal roof, it would stop the condensation. I used either chip board or plywood decking.
My advise is stay out of debt, save for the future and always be improving yourself with new skills and education. Lastly, work at what makes you happy and live a healthy life style.
Retired and happy!
http://austin.craigslist.org/tls/4846381426.html
Never seen one of these before. Thought it might be of interest to some. Posted today in the Austin TX Craigslist tool section.