GHI Electronics on the box, that makes it family of the FEZ Panda, Domino etc; - see: http://www.tinyclr.com/
Have played with a FEZ domino last year and I must say I like it, definitely more powerfull, but the "IDE and prog env." take more time to setup and upgrade.
The multitasking is very convenient but brings its own set of "problems". As I programmed C# almost for a decade now the step to using it was not great, sometimes considered buying a FEZ Cobra or Panda II which is shield compatible (to some level) but never found a good reason.
Personally I think the mbed platform - http://mbed.org/ - is more interesting if more performance is needed.