Not sure if the spike Derek used at Millrose is the TJ2 or not, but it seems like it's possible.
From
http://polevaultpower.com/forum/viewtopic.php?f=2&t=19017&start=24Bubba PV wrote:I saw and spoke with Derek today as he got out of the cab at the hotel in Reno as he has college kids to coach today. He said this calf thing has been coming on for the past couple of weeks as he tries to adapt to a new spike.
From what I can tell the contour of the spike plate is more akin to the old red and white TJ/PV spikes than the TJI's from last year. I'm in the market for some new ones as well, and if these are anything like my ol' red and white's i'd be more than happy to shell out the extra $$ for them. I had two pairs of the TJ/PV spikes and they were the most comfortable shoes i've ever owned. Yeah, i said shoes, not just spikes.
I'll keep looking for reviews and post them on here if I find anything useful.