Then again, as a customer, the $35 + SD card price of Raspberry Pi is pretty appealing.
The price of the Pi is a bit like stone soup. Sounds cheap but not when you add it up.
You have to add keyboard, mouse, SD card, power supply and an HD TV, before you get a working system and then it is Linux which totally cripples it from the point of view of real time control.
Add to that a USB port that doesn't work quite how it should (you can't get a USB camera working) and it is not so much of a bargain.
It has however just been upgraded to 512MB of RAM, as it can only run code out of RAM, this is the same as the Due (well a bit less because Linux has to run there as well)