Many thanks for the heads up on ODROID C1+ , very interesting ... no sata port for SSD but e.MMC option should offer similar performance which also has the option to boot from it 
and is a neater solution not requiring external sata and power cables, smaller form factor ... etc
I'm guessing performance would be up a bit on M1+ A20 dual core SOC ?
My only real concern is lack of built in wifi .. M1+ has built in AP6010 wifi chipset which works very well in AP mode, of course we could add wifi via USB but have had so many issues with external usb wifi dongles (in Ap Mode) with Rasp Pi we would need to investigate what works well .... it was this issue that led us to BPI M1+ ....
Will definitely keep an eye on it ... would like to see some comparison benchmarks ...
Cheers
Jay