Since no-one seems to have given any feedback for over 2 years I thought I should show that there are serious Mac OSX users out here. I've been using this program for more than 3 years now and I'm glad that the seemingly endless 3-month beta updates have come to an end and we at last have a full OSX version, including the flowchart functionality (though I don't need this for my application - battery modeling). I have always found it to be very stable (except for the crash if you forget to load a needed data file). It is extremely fast, powerful and user-friendly. One additional feature I would like would be a scripting capability so that it could be called as a calculation engine for example from an Excel macro. Here's hoping this will come with the future Java version (which will of course be a universal binary wont it?).