I like the light gray gum-soled version. Very cute and casually sleek. My normal size 7 is the right length in this shoe. But for me the heel area slips too much unless I wear socks. (I have slightly fan-shaped feet, so this is not an unusual issue for me especially with slip-ons). With socks, the heel area is ok, albeit at first then a tad snug in the toe area, but that seems to adjust with wearing given the natural sweater-like stretch of the shoe. The Zilkers are a better, more flexible, secure fit for me overall, but as a change these slip-ons are pretty good as a fit after I add socks! I like the look and casual ease, and with socks the fit is fine for me.
I might mention that I also tried the stripe version in same size, and with that shoe, the fit with socks was just a tad bit shorter and still slipping at the heel, enough that they weren’t comfortable enough. So I returned the striped version, but am keeping the light gray. Tiny differences in fit can make enough difference with tricky feet!