Yes, I had to do a restore on someone's PB laptop yesterday and it did get very hot underneath. I put it on one of those "cake cooling racks" that most people have in their kitchens, which lifted it another inch or so off the bench. This allowed more air to circulate underneath. Whether that had any effect or not I don't know, as I wasn't there long enough to find out. Another piece of kit to put in your laptop carry case when you're out and about???