I have a pair of the Smith I/Os and I think they are worth the money. The smaller frame allows as good of vision peripherally as I have ever needed and there are a ton of lens options. Get one lens for bright sunny days and one lens for cloudy/overcast/night time riding.
This is something I really like about the I/O is that they sell them with a sunny and a cloudy lens. I'd be too cheap to buy an extra lens if it didn't come with one. Just being honest.