I had quite a bit to do with the development of ND's eclipse plotter program. For whatever it is worth, you won't find a better bang for your buck. They are very well built, fast, accurate, reliable - and are covered by an exceptional warranty.
From what I hear, they have sold very well. My old pal Geoff Flack (very good guy - one of the best) should be able to direct you to any number of satisfied eclipse owners for a referral.