I have a concrete floor in my studio. I also have flat feet, thus I need really good floor mats in my studio. Over the years I have tried lots of different options for floor mats.
I tried the cheap ones from Home Depot, etc. When they were not soft enough, I tried stacking up the cheap ones, etc. I even let someone at a AAW symposium talk me into a really expensive $200 mat. A sucker is born every minute! I hate that mat with a passion! It will not stay put! It is always sliding out of position! Err!!!
A few years ago I decided to change all of my mats to the expensive kitchen mats with holes from Rubber-Cal. If they are good enough for chiefs who stand on them all day in the kitchen then they are good enough for me.