i did a writeup on the locusts recently - i'd be interested in your experiences as well:
http://www.militarymorons.com/equipm...ar.html#locust
as one who has been cursed with bad eyesight (i don't like contacts and don't want to do lasik just yet), goggle options are limited to OTG (over the glasses) or prescription inserts. i liked the fact that the insert is interchangeable between the sawfly and the locust, as the sawflys are what i wear for shooting. saved me some money there. since i wear glasses all the time, i lean toward goggles that fit over my glasses so i can take off my goggles and not be blind. the ones with a foam face seal work better with eyeglass temples.
i don't really have frequent use for goggles being a civvie - the only time is if i'm shooting/camping out in the desert or at the range and the wind kicks up. i've also worn them on snow hikes to when the wind was just too cold for regular eyeglasses without side protection.
but no matter which goggle i use, OTG or prescription inserts, and how good the anti-fog coating of the main lens is, the inserts or glasses worn underneath are the weak link i've found. i'm not sure if anti-fog coating is available on regular prescription glasses or inserts - they weren't when i had them made. since they're closer to the face than the goggle lens, they're more prone to fogging under exertion. when the temperature finally equalizes, the fogging clears.