So you already have an arai. I would at least contact them and see what they do. I have heard that they are really good about sending out replacement parts, most of the time at absolutely no cost (they do have a 5 year warranty). Not to many companies will do that kind of stuff.
I say that it's more of a personal choice. You have one already, so do you like it? Do you think that it was worth the extra money over the other brands? (kind of hard to tell if you've never owned an inexpensive helmet from another company) I say give them a call before you make your final judgment about their product. If you are really not feeling spending the extra money, then Scorpion is the way to go.
Arai helmets seem to fit my head better than any other brand. Shoei seems livable (but their cost is too close to Arai), and Scorpion is definitely the best deal for the money, but the Arais fit me better, have better ventilation, a five year warranty, a fully removable and washable liner and quick change shields which require no tools and no removal of anything other than the shield. To me all that is worth the price.
For the guy with the problems with the lens, just do it a couple times and read the instructions. It took me a little while to get used to the new system as it is a little different on my Profile than it was when I had a Signet. I like the new system better though, as you don't even need anything to do it.
