It looks like what they used in Philadelphia on the 18th. I was worried that having it on might be a distracting floppy nuisance, but I can't say that I noticed it at all while running. I ran the half-marathon and didn't get a halfway split, but it looks like none of the half-marathoners got split times so I don't know if it was some sort of data-collecting barf or if the mats weren't acquiring properly, although the marathoners got halfway half-marathon splits.
I was concerned about them because they made a big deal to the pace team to NOT bend them or they may not work. I threaded mine loosely through a velcro chip holder that I have on my shoe and it didn't flap around at all and recorded my times just fine. I would definitely put it on the OUTSIDE of your foot so it doesn't hit your opposite leg with every stride. Not sure that it's big enough to do so, but something like that would make me insane.
I don't see how something with that much room for error, ie the bending thing... is even up for consideration in even the smallest of events.<br><br>
OK, well, money of course.<br><br>
The thing is, their technology could be really piss poor and they can always blame it on the runners.