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Matek is upping their game and just released a new F4 micro FC. This is the most advanced and feature packed micro FC yet. It is presently the only nano board to feature the ICM-20602 gyro, which necessitated the rubber grommets. It is capable of both M3/M2 mounting screws and is smartaudio/camera control capable. There is a special full size PDB designed to mate with it. I found only one site presently selling it for $30, which is the same price as the Matek full size FC. I have two Matek F4 FCs and they work flawlessly, and this might be my new go-to nano board. Info and seller links below.