Today the Mac version of Mi-Fi Monitor was approved and released for sale on the App Store.
Though the version number is 1.3.2, this is only because Mi-Fi Monitor is a universal app across iPod, iPhone, iPad and Mac, they all share about 80% of the same codebase with platform-specific interfaces built on top.
The Mac UI is relatively new and may need to be refined a bit, but the core functionality should be very stable.