I have a EXO 700, and have had it for about 1.5 years as well. When I first got it the pivot kit was somewhat broke, called scorpion and they sent me a new one right away. I've been having some problems with it this week, so there sending me a new pivot kit this week, free of charge, never asked for warantee etc. just great customer care.
The helmet could vent a little better I think, but its much better than all the HJC's and nolans I've tried, also vents comporable to the low end shoe and arai my buddies own. The only better venting helmets I've tried are the real expensive ones. Overall I think its the best helmet you can own for the price.
I've had no problems with rain coming in at all. One of my buddies has a EXO 400, and felt the need to add some sealant around the faceshield to keep some minimal wind from coming in and getting his contacts/eye's dry. Maybe its a problem with the exo400 line??
the 700 has improved venting and replacable parts, I don't think there's a huge cost difference between the 400 and 700 so I would spring for the 700.
I love the anti fogging, but if you want to clean the inside/antifogging side, make sure you read the cleaning instructions. I cleaned it like I do with the outside, and scratched it up with the lens cloth I owned and had to buy a new clear sheild.