PRO Vibe Sprint stem vs. Zipp SL Sprint Stem

So I’ve seen the Tour Magazine data on the PRO stem but haven’t seen anything on the Zipp. Does anyone know of any testing data, and absent that, anecdotal experience with these two stems?

Give this a read ::

https://fairwheelbikes.com/c/reviews-and-testing/stem-review/
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Sorry my meds from a Sunday crash must be getting to me. I meant Fairwheel Bikes data, not Tour data. But yes, I’m familiar with that report. Unfortunately, they don’t test any Zipp stems, including the SL Sprint.

Cav rides the Pro Vibe. Must be better.

Is this tour data form the latest March 2015 Tour issue.

Except that Cav actually rides on the Zipp SL Sprint now (and no, this is NOT the reason that I am interested in this stem).

http://velonews.competitor.com/2015/01/gallery/pro-bike-gallery-mark-cavendishs-specialized-venge_359180

I’ve got the track stem from Pro. It’s lovely and stiff!!