I just received these shoes in the mail yesterday and immediately put them on and wore them to a 1 hour zumba class.  They felt great!  I already have the Studio D Ryka's and I like them too but for spring/summer I wanted something mesh so my feet would be cooler.  I also like that these are wider since I have wider feet-the Studio D's are much more narrow.  These do make my feet look bigger which is the only drawback I guess but I really don't care about that-at my age comfort is what I'm looking for!  I like the black color-goes with all my yoga pants...however some funky colors would be a nice addition and would likely inspire me to buy another pair at some point!  :)  Also, these run true to size-I generally take an 8.5 or 9 in athletic shoes.  Since these were wider I went with the 8.5 and they were a perfect fit.