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I recently got myself a Banana Pi M2 Zero board while ordering other stuff at an electronics distributor. The M2 zero is the same form factor and feature set as the Raspberry Pi Zero W (the GPIO pin headers are said to be compatible, it has WiFi and Bluetooth built in and an USB OTG port). The CPU is an Allwinner H2+, a quad-core ARM processor running a 1GHz clock speed, RAM size is 512MB. Processing power is probably comparable to a Raspberry Pi 2 board.
I bought the M2 Zero to use it with an RTLSDR stick to receive the signal of my outside RF temperature sensor. This worked with the Raspberry Pi Zero W, but was a bit too much for the slower CPU which has other more important things to do anyway (playing internet radio Image may be NSFW.
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, so the M2 Zero was a cheap, more powerful alternative. The box will be running headless and thus I do not care about support for graphics and multimedia anyway.
In the end, I switched the RF receiver to a RaspyRFM board whih is using less energy and simpler to use than an RTLSDR stick just to receive some sensors and now the M2 Zero board is free for tinkering...
