May I express my surprise that one of the first projects they worked on has not yet been mentioned? While it has been a couple of seasons since my last ride on The Beast (KI), it has, in my opinion, aged well. While Summers and Dinn were not the only ones involved, they were certainly prime movers in the project, though they are often blurred into the categories of "The Kings Island maintenance/construction team" (Dinn) and "Curtis D Summers engineering, in conjunction with Taft staff designers"
If there's one that has aged well, it's The Beast. Certainly better than low 40s in the wold.