I don't know about the Shoei but while I love the Suomy Extreme. It's light weight and the graphic is "extremely" cool. The few things I don't like about this helmet is that it's noisy. Changing the face field is a PITA process and the tab can be broken quite easily. In addition, a replacement face shield cost $75> the last time I check :yikes: If you don't fiddle around with the face shield like I do, I think you'll love the Suomy for it's lightweight, coolness factor, and protection as long as it really fit your head.
Btw, make sure you try the helmet on for at least 15 mins. Every helmet will feel as though they fit like a glove the first time you put them on for the 1st 5 minutes. It isn't until a while they start to conform to your head. If I am paying hundreds of dollar for a helmet, I'm really going to make sure that it's comfortable in the long run.