When I did my 380, I popped for a Mercedes chain with the old-style clip and used it. But I would have used the C/E clips had I gone with Iwis. For me the clinchers were that no one could cite a failure of the clips, and the MB manual did not recommend crimping. Plus I thought that the clips were a better bet than my first attempt at peening.
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe