The reason why everyone's having this problem is because I only released 20 coupons, which were used pretty quickly. I've released 20 more - they should work now!
The site looks good, the preview screencasts are good quality and the voice and inflection of the preview I looked at did not grate on my ears (like some other screencasters, not naming any names). Overall, I'd use this, as I have used others in the past.
Coupon not working for me either. "no longer valid"