I can confirm that the FSA Kwing is indeed very flexy. I'd venture to say the point of being too much.

I have 2 obtained at various times under different circumstances.

The first was used on a single ride. Vague, and disconnected are words I would use to describe it. I basically removed it the moment I walk through the door after returning from the ride.

The second bar is on a gravel bike. It completely sucks the life out of the bike in a general sense but it does indeed smooth out rough terrain. On that bike I am squarely undecided. It would shine on cobbles.

I'd say the Kwing is suited to much stiffer rides than I own.

Too much of anything isn't always a good thing.