The only problem is that most of them require 20% included gratuity, so you end only saving a few bucks per coupon. For instance, I bought a $25 certificate for $4, but I have to spend a minimum of $35 with 20% gratuity. So for a bill of $35 + $7 tip + $4 for GC - $25 gift certificate = $21 spent at shitty Indian restaurant. Diarrhea, priceless.
They are really only a good deal when you buy the $100 ones and go all out at a nice place.
eta: join their email list and its almost always 80% off or something so you only pay $2 for the certificate.
This post was edited on 2/4 at 4:22 pm