Oldest to newest of my current lids. Here's my take on them. Shoei RF-1100
Pros: This helmet is lightweight and breaths very well with all the vents open. It cuts through the air pretty well. Very comfortable. Sheild is very easy to remove and replace in a hurry. It's a Shoei...
Cons: I've had a little bit of wind buffeting at high speeds with it. Especially when turned to look over my shoulder at a blind spot or something. It can get noisy. Not too bad but still a little loud at high speeds or high wind.
Opinion: I really like this helmet. I also like the locking shield. It's a Shoei... I've never owned one I didn't like. It has served me well and continues to do so as a backup lid. I'd definitely buy another one. Shark RSi
Pros: Killer looks and profile. It's got a very aggresive styling to it. Breaks through wind really nicely at high speeds and while turning the head. Very comfortable. Light weight (Same exact weight as the Shoei RF-1100). Lots of room for headphones.
Cons: Limited sight... it's got a thinner gap from forehead to chin bar so you lose a little sight line. Really have to trun the head to see over the shoulder too. The shield has no locking mechanism and mine seems to have a loose fit to the sheild has flipped up when doing a lane check more than once. It doesn't breathe all that well. The vents are small and it just doesn't move air. It's gotten louder.
Opinion: I like it for the styling... but I might consider an upgrade to this line from Shark. Or maybe even another brand. If I saw a good deal on one like I did this one. I'd probably buy another... but would have to be a great deal. AGV XR2
Pros: Fits awesome! Looks great. Tear offs are nice. Breathes very well. Plush material inside. Very comfortable. Light weight
Cons: Sometimes I'll get a burst of wind up through the bottom. Kinda weird... only has happened on the track though.
Opinion: Would totally buy another one. Excellent quality for the price. Paint is very nice.