A few things I noticed with my steelpad 4S:
- It was cold
- It was hard and uncomfortable
- It had no friction (you need a little at least)
- It cost me loads in teflon strips
- It wore out and went shiney within 5months
I have some images somewhere.
I know some people like hard mats, but to spend so much on something that only lasts a few months is a waste imo.