Needless to say, I made a quick and easy decision to try TaxCut this year. After a simple installation process, I launched the program and started walking through it. At first glance, it seems more than competent for the task at hand. You work in an interview format in the top half of the window with the tax form visible in the bottom half of the window, and the right-hand column is a selection of context-sensitive help items. I noticed a couple of very minor visual glitches (radio buttons, mainly), but overall, this appears to be a nicely ported application and it's quite easy to use.
If you're want to stay away from Classic (and save a bit of money in the process!), you may want to give TaxCut a try. Although this is clearly an example of 'first to the OS X market' winning my dollars, it appears that TaxCut was worth the investment based on my initial look at the program.

