Worth a punt for that price! I should say, my experience probably wasn't a very scientific a-b test. The bike that had the damper fitted was much newer and less ragged than the bikes that didn't.
The problem is i have been barred from buying more cargo bikes so the only choice is to obsess over accessories, drivetrain and fiddle endlessly with the ones that i have
Hmm ok, i impulse bought a used one (20$) but the consensus seems to be it is great or it does nothing lol I guess just need to install it and see