If your LDS can't figure out how to order/change lenses in a scuba mask, how are they going to handle the OW class?
To a certain extent, I wonder the same thing, but I'm thinking and hoping that it's just that the person who was trying to help me didn't know much about the prescription aspect of a prescription dive mask. She admitted that she didn't know what the numbers meant when I showed her the prescription, and I kinda think something got lost in translation when we got a response from the place where they get custom lenses done.
I've done a Discover Scuba with these guys and was pretty happy with the experience, and so far have felt comfortable with all the people I've met in the shop.
I'm going back there tomorrow as my friend/future-dive-buddy needs to get her personal gear (and I still don't have a snorkel or boots to go with my Jets) and will hopefully have a different experience.