I looked at the AGV S4 but it didn't fit my head right so in the end I went with the one that fit best which happened to be a �99 Caberg Trip. It's a fighter pilot style flip-up, has an extra sunglasses/shade bit you can lower with a switch on top and I've no complaints so far. They seem to be very common actually - I was grabbing a cuppa at Bahnstormers (BMW dealership) mid-ride and the guy on the next table had one, then a guy arriving on a big beemer was wearing one too.