Product review (5 stars): I love these!
I have a knack for burning my wrist and forearm taking things out of the oven.  These prevent that.  They do require that you use a bit more effort getting things in and out.  But I have used them for years and never been burned while they were installed.  I don't know if it is because I am using more care to get things in and out or if they are actually protecting me.  I think some of both.