I loved ProMash... It was the staple on my PC... Later I found Beer Smith. The user interface was great! It was, (is) regularly updated as far as I know and a very solid program...
Then comes my iMac... So while I love ProMash and Beer Smith on my pc's, Beer Tools Pro is just unreal on my iMac's. A bit of a learning curve for sure, but a great program.
If you are interested in Beer Smith, I could not give it enough kudos! I believe that they have a trial package, I may be wrong...