Arduino against Arduino: Founders argue about the company
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The LLC mostly cares about the idea and the software and is thinking about allowing other manufacturers to use the Arduino name (All the third-party boards right now legally only can say "Arduino-compatible" and can't use the logo). The SRL manufactures all the official boards right now and of course doesn't like cheaper official alternatives and is more oriented towards industry cooperations and getting an IPO. With the renaming and a new website (arduino.org, against the original arduino.cc run by the LLC) they are trying to get a stronger association between the name "Arduino" and themselves.
mBed is far superior at this point in almost every way.
That said, I hope they don't screw it up. There have been folks who did and allowed folks who were prepared to jump into a fragmented market to come in and take it over.