have already tried on both the Leatt and (what I think was an older style) of TekVest...maybe the newer ones are different...?
The only Tekvests that work with the Leatt Brace are gray in colour, I had the 2nd or 3rd original demo made for about 2 months to test I got it from Mr. Tekvest himself actually took it off his back when he returned from a Round Algonquin Ride, and now have one of the 1st production ones at my place. So, in short if it was black, it would not work with a Leatt. The production units I think are just now going on sale.
As far as adjusting the height front and back with regards to vision, mine is adjusted the complete opposite in the back - all the way up. But there may be a few differences to consider. If they are using chest protectors/roost protectors and pressure suit style armour that might be the difference.
One thing in the Leatt instruction manual is that it says it is supposed to be worn a close to the body as possible, so minimal layers under it. I tried wearing it over my Klim Jacket (enduro style jacket) and I found it to be sloppy and not nearly as supportive as it was without the jacket.
Regardless, for that sort of money it is best to be 100% sure of fit.
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