I have been here for an eye exam, eye glasses, and just recently for sun glasses. I went on a Saturday evening for my eye exam and ended up waiting more then an hour just to be seen. They tend to over book on weekends, so book your eye exam either for early morning or for a weekday.
As far as glasses or prescription sunglasses.. they have a pretty big selection for all price ranges and styles. They always have coupons in the paper. So if you wait for a good coupon, you can get a great deal.
Both times, my glasses were done in an hour like promised.