Amazon shipped me the standard OOahh Slide by mistake when I ordered the Sport.  That made me curious as to what was different so I asked Oofos directly what the difference (besides $15 premium) is between the Slide and the Sport, and they said there is absolutely no difference except for the extra decals on the Sport.  I returned to Amazon and bought a pair of $45 Slides locally, and decided on size 12 vs 13 that I originally ordered, so I agree with the other reviews to size down on these.  Good product.  While the Sports look better, I don't think a $15 premium is worth having extra logos.