I have a CycleAware mirror on my Giro helmet. I had to carve a notch in the side of the visor (no big deal), and I had to re-engineer the adhesive system when it wore out (again, pretty simple), but I have been absolutely delighted with it. Like the other mirror evangelists, I now hate to ride w/o a mirror. I even miss it when I am walking or jogging along the road and want to see traffic coming up from behind.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069