I have been waiting for something like this for so long! I was always trying to find a thicker but stable yoga mat, and stakt meets all the criteria- plus, the foldability of it was something I hadn't anticipated being so useful. It offers new exercises and more support. BIG fan and I love not having to grab a towel for extra knee support during exercises.
I've only used a handful of times- sometimes I get confused on how to fold it, but am sure that will be clearer over time. Also, I am curious about how the firmness of the mat will stand up over time.