Well, here's my first-hand experience with a next-gen controller.

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Hi everybody.  This is Domo.  You've probably seen him before.  Domo is about 7" tall.

He found this remarkably rare (especially in CA) Xbox 360 Controller for Windows after biting some jerk's head of at Best Buy.

He turned the package around to read the back, but because he's Japanese, he didn't understand any of it.

Fortunately for Domo, even though he can't read English he still knew it was a controller and just happened to have an XBox S-Controller lying around the office.

After unpacking the controller, Domo measured it... 6" across.

Then he checked how tall it was... 4.5" tall.

He put the two controllers side by side, and saw that they were in fact pretty close, but there wasn't as much tilt in the wired 360 controller (The S is 6"W x 5"T).

Domo has always been a fan of the S Controller, with Sony's Dual Shock 2 running a distant second.

But he felt right at home with the 360.  Summed up in one word, "WOW"

I had to threaten to beat his face in before he let me try it.  I was quite satisfied too.