Much like joh4203932, I too wear glasses under these and the fit is fantastic. I also wear a Smith helmet so the interface between the two is great (imagine that). I have the sensor mirror lenses in these and they are so great for all conditions, except for blindingly bright days. On a heavy snow day I was in the parking lot with my girlfriend and she made mention of the bad visibility. I told her I could see fine and then handed her my goggles. "I F@#$ing hate you" was her response upon looking through them.... she now owns a pair with the same lenses as well.
Great fit (larger face), glasses compatibility, and fantastic optics. Smith knows what they're doing when it comes to making great goggles.