Surely, one can use 3 ARMs just as well? The idea of of using multiple 8051/2s is not a new concept, and is largely put into practice everyday, however, a designer could potentially do the same with a 32-bit mcu and I have seen products that gloat about the sheer awesomeness of having multiple (3 in fact) 32 bit ARMs. The product is highly specialized in my field of practice. I guess depending on the complexity of the project a processor could be chosen? I do like the idea of being able to pick and choose the options by using multiple 8051/2s and increasing efficiency by using more than 1 chip.