If you’re familiar with the iOS version of this app, you’ll have no trouble getting started with this OS X version. I haven’t found anything missing in this version that is in the iOS app, and there are several very handy keyboard shortcuts that the iOS version simply can’t support. I was also pleasantly surprised when I started this application and all of my “favorites” (both radars and locations) were there waiting for me. The extras in the OS X version include keyboard shortcuts to immediately switch between reflectivity, velocity, and storm-relative velocity, zoom in/out, zoom to radar range, tilt up/down, among other handy, but less-useful ones. The nature of OS X applications makes this already-useful application even easier and more intuitive to use. There is additional functionality (which includes lightning display) if one has an AllisonHouse subscription and connects to it from this application. Note that NOAA/NWS is prohibited from supplying lightning data in real time and detail, since the data source is privately-owned. Other features (like 3-D viewing) are available in much more expensive programs (for PCs, at least), but at $30, this program seems to be well-supplied with features. About the only thing I can think of that would be a signficant improvement, and that wouldn’t justify a much higher price, would be better road maps. The ones provided are (as far as I can tell) limited to major highways (generally US/Interstate, but not state highways). This review is by a professional meteorologist who does not have an AllisonHouse subscription.