My name is Keith, I am the service manager from MMC John Deere at the Glencoe Mn location.  We currently have a NEB 800 dyno, (our company as a whole purchased several dyno's from AW).  The machines have all worked flawlessly, they do not let us down and give us very accurate readings. We are very happy with the product.  The real advantage of our dyno is the company behind the product, Del and his employee's deliver top rated service.   A machine can be the best, but if the service is questionable, the end result may not be well received.  I would very much recommend this company.