Although MotionPlus adds 1:1 functionality to the Wii Remote, Mahajan said he thinks it "should be a lot closer to the Darwin." He explained: "It’s still missing the magnetometers, so it’s still a system that needs that IR strip to figure out where it is, whereas the Darwin is completely self-contained."
Although Nintendo's attributed the creation of MotionPlus to requirements from developers and the decreasing cost of components, Mahajan thinks the company's been inspired by his. "If I’m not mistaken, there were a number of postings and blogs, and we’ve been hearing through our friends and family, so to speak, that the Wii MotionPlus was a response to the Darwin.

"When a few people told us that, we thought, “How realistic is that? Here we are, this little company with 15 to 20 guys in Cambridge, Massachusetts.” Oddly enough, blogs and little postings started popping up everywhere, and we thought, “Well, maybe there’s some truth to it.” Though it doesn’t really affect us."
Mahajan also spoke in detail about the capabilities of the Darwin, the creation process and future plans. On parnerships, he said, "Obviously, everyone asks, "Are you working with Microsoft, are you working with Sony, are you working with this company, are you working with that company?" And I'm like, guys, I can't tell you because if I was working with them I'd be under a nondisclosure agreement."
At the end of the day, Mahajan said he and his team are "just really happy to be in this space," and added, "Everyone we talk to expects us to bash the Wii, and all I can say are good things about them. I think they've done so many wonderful things on so many wonderful levels."

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I really hope MotionPlus is good.