As per the Femto standard, knocked it out of the park with a hell of a design. There's no way so much power and connectivity should fit in the size of a thumbnail, yet here we are. Can't wait to see what comes next!
This wunderfull super tiny board can be easily used with Arduino, after installing the official Arduino SAMD21 library. It really amazed me what this tiny little thing can do! And it's fully compatible with all my older Arduino projects, no hassle with porting from AVR to ARM. Don't really know what to say, other than buy this tiny wonder of technology - for this price and quality, it's more than worth it :)