For those of you who have NOT used the site before : Some things you should know (that's been covered/hasn't been covered)
The comment that it is more like a coupon than a gift certificate is spot on. It's still a gift certificate in the sense that you do get 25 bucks of stuff for 8 bucks, but you do have to spend more than 25 bucks (usually 35 at most places I ate at but it varies) so it's not something for free, but it's extra stuff compared to what you would get.
25 usually requires 35-45 dollars (sometimes 2 person minimum, I don't think Alcohol has ever counted at any place I've eaten at).
100 usually requires 200 dollars and a person minimum. The one time I used it we had a party of 8, so we easily exceeded the maximum. Don't think you're ordering a 100 "gift certificate" and taking the wife out for good eats. OR you'll have to find friends (possibly 6...) to go with you.
1) Almost EVERY restaurant has conditions to how it can be used - Not available on alcohol, must in x number of parties, etc. I think every place I've used has had gratuity added right off the bat. Each place varies so read what the conditions are carefully.
They list it several times - Once on the page when selecting restaurants, the page with the restaurant info, when you order, etc. Just take a look at it.
2) It's nice since it lets you try places you don't normally try (which i believe is the point). It will also save you money at restaurants you already know, might not normally go to cause full price is pricey/etc.
3) Print out your coupon, don't lose it, don't call the number on the coupon and use your coupon code or you just wasted your money. (Well, they might give you a refund if you explain, but I don't know, I've never done it - It will prove you're bad at reading).
4) Sometimes the site is slow. Try again later, I don't think they're on the best host - but when the site is working it's nice.
I've used it several different places (probably 5+) in San Diego and Orange County have had no issues using the coupons. I usually tell the waiter before I order that I have it (some places specifically tell you to, I think one person specifically said wait till you get the check). If the place doesn't specify, I just put it out there that I have it. They sometimes didn't know what it was, but I've been able to use it everytime.
They sometimes have the place's menu on the site so if you're trying somewhere totally new that you've never heard of - it's helpful along with the information they provide to get an idea of what kinda place it is.
Selection does leave some to be desired depending on where you are. OC/SD has a lot of entries relative to other areas, but it's still isn't going to cover even the vast majority of places.