I have been using these shoes for Zumba for three weeks and have been very happy with them. Extremely comfortable and light-weight.  The crazy bright green is perfect for the fun, colorful Zumba atmosphere.  If there were one thing to be mindful of is if you have slender feet, the toe area is wider than other ASICS. I need to tighten my shoes firmly.  I don't think going down a size will help, they seem true to fit.  Overall I really love the shooes. ASICS have never let me down.