Hi
Am I right in thinking the Due is a replacement for the Mega in the same way as the Uno superseded the Duemilanove? Or is there a reason you'd buy the Mega still? I've not had reason to grab a mega nor Due but can see a place for the more capable boards even with cheaper dev boards around. The common IDE being the main one, especially for kids learning.
The limitation that stopped me running out and grabbing one is the inability to move to a standalone processor as easy as we can by developing on the Arduino with ATmega. Being able to use ATtiny or ATmega chippies simply removes the cost barrier from having a go at all manner of projects for me.
Having said all that, we already have a Raspberry Pi for every TV in the house...with a "need" for two more that we've identified...so whichever fits the task best works for me. It sure is exciting to have all this choice.
Geoff