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I've considered it, but the cost/benefit calculation makes ARM boards way more attractive.

They are way more capable, and they actually cost less than ~$3 each for a simple QFP48 STM32F103 or STM32F051 board, and the smaller chips start around $0.75 for my PCBs.

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Definitely. The STM32Fx line is awesome.

I was mostly thinking about alternatives for people who are currently using Arduino and want to keep the same toolchain, libraries, etc. but at a lower cost. If someone is comfortable moving outside the Atmega ecosystem, I would recommend ARM chips as well.

There is official port of arduino for some nucleo boards. I've chosen one for making commercial product. I can use arduino libraries for prototype, and if it won't fit my needs I can always go with C.

Arduino port is just wrapper around stdperiph HAL...

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