I switched from a pair of Mac Pro's to a 15" Macbook Pro last year. The 15" was the first laptop to support quad 4k displays (what I was using with my Mac Pro). The laptop has been fantastic, with the exception of cooling. The cooling is bad enough that I keep it (when it's hooked up to my quad 4k displays) upside down, with 2 plastic cups, to keep it from overheating.

I'm mostly interested in the enhanced cooling. If it's really that much better, it may be time to upgrade. Has anyone had similar experiences?