Surface will leave scratches on your shoes if any but the heels lay on it.

I didn't like the rough surface, so I bought a large mouse pad to place on top (https://www.amazon.com/dp/B014CUECC0/ref=cm_sw_r_awd_QIJiwbEZHW9D7)

I think it's going to slide around on a hard surface like tile or hardwood floors

A nice rubberized surface would make this footrest perfect.

Given that nobody's supposed to stand on this, the manufacturer seems to have chosen the wrong surface - any kind of rubber or carpet would have been better