I like this chair mat a lot - I wish I'd bought one sooner for my home computer desk. It saves wear and tear on thick(er) carpet and I think my chair will last longer too (less strain on casters etc. because it rolls more freely). It's a bit soft (so it won't crack on deeper carpet) so chair casters do leave a bit of a "dimple" if you sit in one place for very long but if you're shifting around no problem and any deeper dimples gradually spring back. The only "negative" (which is not terrible) is the very soft plastic gives off a distinct "plastic" smell for the first couple of weeks (off-gassing). But overall I'm very happy with it. I'd buy another if this one wears out.
This is the only clear plastic carpet mat I have seen. It has ;projections on the carpet side to hold it in place as chair moved over it from desk to computer.