Purchased the Pro-line from Karl due to the size of our house/field. Installed in Jan/Feb of 2012, after one year of flawless operation, I highly recommend Aerostream. As advertised, it negated the odor, restarted our field and relieved an inordinate amount of stress. We too were offered a new field at roughly $12k-$14k, although unecessary. Installation was easy, Karl was available for technical feedback, absolutely could not be happier with the experience.