I have one by Lori Holt/Riley blake and was surprised at how thick/soft it ish. I find myself pushing too hard into it and won't order any more (I have multiple color mats for my vision problems.)
Martelli or Olfa or Fiskers for me.
and if you don't shift/turn your mat around all the time a large one is not costeffective because you won't used 75% of it.