I have been riding on these bars for a number of months now and they are extremely comfortable and VERY responsive/stiff. I legitimately feel like I can sprint longer and harder than previous bar setups I have had due to the construction. It took a little getting used to going narrower on the hoods, but the flared drops are certainly nice for added control (37/42).
I am thinking about putting the 39/44s on my gravel bike and getting the aero clip-ons so they can be used on both bikes.