Having a Forumslader and a Sinewave I can say that I definitely perceive a difference in drag between the two, with the Forumslader having more drag than the Sinewave. I initially thought it was my imagination so I disconnected the Forumslader mid ride and the difference was distinct. As an aside, I still use the Forumslader exclusively and on every ride so I guess I'm not too bothered by it.