I'm not surprised that it is well-designed because the 360 has the best overall *traditional* controller ever designed (though it would be nice if they made that ridiculously stupid Sidewinder d-pad design go away 12 years ago, it sucked then, it still sucks now).
Overall, whoever designs Xbox controllers deserves a medal of some sort. It is, hands down, the best traditional controller I have ever used. It makes Sixaxis look like it was designed ten years ago (wait, it was).
With that said, I won't be buying this chatpad. I send voice messages through XBL, it's much easier.