I've had an X-602, the design is starting to show it's age compared to what's available now. The top vents can open by themselves with enough wind pressure. On a positive note, the visor mechanism is excellent, far superior to the Arai TourX 3 I use now. A friend of mine has an XR1100, he says it's a great lid, I don't know much about it, he works for Hein Gericke and had his pick of every lid they stock, so that's testament to how highly he rates the XR. My friend hates AGVs, hates wearing them, hates selling them and hates having to work through the mountain of warranty returns they generate. My girlfriend has a Stealth SV, she picked it herself, if I'd had anything to do with it she'd have had anything but that.