Beagle Bone Black and Cubieboard are wayyyyyy more powerful and more stable (I'm testing the BBB for months, incredibly stable, and the Cubieboard for like a week only).
I don't imaging running my miners on RPi anymore, they are not as stable (I think it's because of the SD Cards... both BBB and Cubieboard have embedded MMC).
I've got BBB also and it is is pretty nice but for me running RPi has seen very good uptime, and it seemed like a waste to put the BBB on mining when it can do so many other things.
@babaji.ca - 1 of the 2 miners is in an encloser with no heat sink or air flow, the other simply sits on the carpet (literally). My media playback machine plays a loop and is inside the the TV with the heat of the RPi along with the heat of the TV, the only problem I have had was due to a bad storm that had several power outages. The SD card card was corrupted but not ruined (sudo fsck took care of it).