When riding the 357 around the shop and sitting on it we noticed that they flex. The shop owner is around 200lbs, and when he pushes down on the suspention you can see the bars flex a bit and you can defenetly feel it.
I was able to flex the blackmarket bars visibly in my local shop. They were attached to a bike that was on a workstand... I didn't even need to sit on the bike and torque hard or put my weight into it.
And I'm NOT a strong guy.
Maybe when the blackmarket bars are cut down a lot they don't flex as much, but I'm going to stick with my trusty 2" ProTapers.