Actually they have a larger lens available to open up the field of vision of the goggles. They're slightly wider but quite a bit higher.
I don't know how much I'd use them either, therefore I'd like to buy used and save a few bucks. I'm assuming from the title of your ad that the USB cable and battery are also included? I don't mean to insult you, just making sure. Also, what type of payment method do you prefer if I decide to buy them? Thanks, I'll be in touch...