One week after purchasing two certificates to a restaurant, the restaurant no longer accepted Restaurant.com certificates. I felt this was an inconvenience at most, so I followed R.com's instructions and went to exchange the certificate.
Their site is so poorly constructed that I was able to exchange the certificate without registering my account first -- so I'm not entirely sure where that "eGift" credit went. After I signed up (great, yet another site I have to register on), the credit still was not present.
I am inclined to believe this whole operation is a huge scam. I would NEVER purchase another certificate with Restaurant.com, and if I was given one, just throw it away; it's more than likely useless.