I first bought a pair of 9.5, and immediately returned them because though the length was good, my feet just felt too tightly sandwiched in the shoe, as it there weren't enough space or wiggle room for the top of my foot and toes.

I then ordered a pair Nike Musiques and returned them,  (too bulky and stiff), and finally the Zumba brand shoe, which I also returned (cheap construction, and only whole sizes, 9's too small, 10' too big). So, desperate to find a Zumba shoe to save my screaming knees, I ordered the Ryka's again, in the same size, hoping that there was enough variation in the manufacturing process that I'd get a pair that weren't so snug. Well, they were just as snug (though still long enough), but given the rave reviews, I diligently wore them to Zumba. The first two classes, the snugness was still noticeable, and my toes actually went a little numb at one point. But, magically, by the third class, the shoes were completely broken in, perfectly comfortable, and no toe numbness. Also, they have good support, so all that jumping up and down isn't so jarring anymore.

Now I wouldn't trade these Ryka's for anything. My knees are doing much better, and the freedom of movement (especially for the pivoting moves), is almost effortless. I actually am more likely to go to Zumba now because I know that I won't have any discomfort.