I don't have any experience with the Smiths, but I do have the Oakley Airbrakes. I was lucky enough to get a pair for free, otherwise I wouldn't spend as much as they cost.
One thing that I really like about them compared to my other goggles (von zippers) is they are weirdly clear. It is hard to explain, but I think it is something to do with the lens shape that makes everything look really good.
Other than that the quick lens change is more gimmicky than anything, but it is easy. If you have lots of money to spend on them, then yeah they are pretty good.
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