Develop, Traveller's Tales director Jon Burton voiced concerns about Microsoft's motion control solution, Project Natal. Specifically, Burton stated that Natal's lack of controller input as well as input lag could limit the kinds of games made for it, though he did admit that the device is "exceedingly clever." Burton prefers Sony's motion controller, noting that it will be "cheap, accurate and will put buttons at your fingertips," which should make it suitable for a wide range of games.
Still, Burton admits he was "stunned" by the technical wizardry of Natal. With the experience of having his own motion capture studio at TT, Burton states that getting "anything resembling mo-cap" in real-time from a single camera is "nothing short of amazing."
For what it's worth, Burton has not used a final version of the device. We noted Natal's input lag when we tried it at TGS earlier this year, where Microsoft's Kudo Tsunoda assured us the final product would iron out, or at least ameliorate, the issue.