Yeah the MAC compatibility is an issue at the moment but they have promised to develop a MAC version too in the near future. The fair (in my opinion too) price was a major attraction for me in addition to the ease of use compared to a lensalaign or DYI setup. I might upgrade to the Pro version based on the upcoming features but would like to get more feedback from other users before I make a decision. For me there was maybe 20-50 (rough estimate, will record precise number when I use the tool again) shots per lens per one fully automatic calibration. Don't know if that's enough or too little but the results seem good to me.