I have used ProMash for many years and thought it was the greatest software for homebrewers... and for many years it was the absolute best. Last year I decided to try BeerSmith after my brew buddies kept telling me how much they liked it. Now as they say its hard to teach an old dog new tricks - I was very comfortable with ProMash and resistent to try, let alone change brewing software. However, after struggling thru the learning curve of BeerSmith, I find it to be very, very good. I still have both softwares on my computers and I find I have switched entirely over to BeerSmith. ProMash was the Volkswagen of beer software, very easy to use with instant good results. Still nothing wrong with it, works very well. BeerSmith is more like the Cadillac, its got all the cool tools and cool gadgets. It helps to be at least 3/4 nerd or a rocket scientist to utilize all its capabilities.