I am a gym rat and take all kinds of classes--step, spin, muscle conditioning, boot camp... and Zumba.  I hesitated to purchase and have to tote another pair of shoes with me to the gym, but after tweaking my knee in Zumba class when my cross-trainers stuck to the humid gym floor, I broke down.  These shoes really do make a difference for the quick turns and twists in Zumba, but don't try and keep them on for any high impact activities as they lack the support.  They are lightweight and fun-coloured.  My one complaint is the length of the laces--they are SO long that I have to double knot them, and make the loops large.  Goofy looking, but if I don't, I step on the ends and they come untied while I'm dancing... not cool (especially when the instructor has to tell you to tie your shoes in front of a class of 40 hip-shaking ladies!).