I tried them. They were like regular magnums on me, only with more headroom. it essentially gives the girl the sensation of a big dickhead fucking her rawdog. If they made them in an XL it'd be better. I love the XL, it's the most comfortable for my 7"x6"er. But if your bf is legitimately 8"x7" it will be quite uncomfortable. It's already uncomfortable for me and I'm an inch smaller in both dimensions.