SBC3 just came out which replaces SBC2.
http://www.phidgets.com/products.php?category=21&product_id=1073_0

Runs Devian 7 as opposed to version 6 in SBC2.
Double the RAM and flash.

Is SBC3 still compatible with Roastmaster data logging in-app purchase?

I have 29 roasts with Roastmaster and just purchased SBC3 and other parts for wireless temp logging.
I just realized that your instruction PDF shows SBC2 so I was wondering...