We visited Asuka with a $25 Restaurant.com gift certificate planning to spend about $75-$100 overall. We were met at the door with a notice saying Asuka no longer honored them. The hostess didn't greet us so we asked about the certificate. She scowled at us and said, "Not again! You are the fourth person to try to use these!" She told us to take it and use it somewhere else. When we replied that we could not, she rolled her eyes and sighed heavily, saying she would give us $10 off our meal but wouldn't honor our $25 certificate. We would have eaten there anyway, but she muttered under her breath and walked away from us. The hostess was so rude, abrupt and argumentative that we decided to leave.
While I understand that sometimes complications arise when a restaurant can no longer honor a gift certificate or discount, one would expect an apology or at least an explanation rather then rudeness and abuse.
EDITED TO ADD: The purchase date on this gift certificate was November 28, nearly one month *after* Asuka stopped honoring them.