Like many others, I was searching for a shoe specific for Zumba.  I had been using cross trainers and they did not allow enough flexibility for twisting and some of the dance moves you do in Zumba.  My knees were starting to really hurt.  I read that for dance type fitness classes you needed a shoe that had circular tread on the soles to allow for easier twisting and dance type moves.  I noticed that my cross trainers were definitely not circular and came across these shoes and saw immediately the difference in the tread on the shoe.  I read some of the reviews and decided to give them a shot.  I have been wearing them for about 4 months now and I only use them for Zumba.  I have noticed that when I take Zumba on a floor that is really slick they actually don't grip enough, but I can not complain.  I love that I can do the different moves without my knees locking up.  I will warn you that you should not use these for other fitness activities that require more gripping and support.  I accidentally got on the treadmill at the gym one day forgetting I had these on and my feet immediately began to hurt.  I also ordered a size up and they fit perfect.  I also like that they are low profile and light weight.  I have had absolutely no issue with the quality and after 4 months they seem to be holding up pretty well.  I do Zumba 4 nights a week and they are still in very good shape.  I absolutely love these shoes!