I was just coming here to add what you did, Z, now 80% with SAVE code.
I did use a House of Blues back in Dec.
As said above by PP, I too have used these frequently here in home area, Chicago. They work great. 18% is always added automatically for tip, on pre-discounted amount, (as it should be), though you could tip more, or contest if you felt service was lacking.
I stay at the Swan/Dolphin most trips and have eaten at many of the restaurants. All are at, unlike the stated guess above, or above Disney standards, in every respect, including catering to allergies, gluten, kosher, specific needs, etc. As always, best to give notice to the restaurants, if possible. Here are all the venues..
http://www.swandolphinrestaurants.com/
The Recipe Club will get you room discounts...
http://www.swandolphin.com/signup/
Keep in mind that the signature restaurants take TiW card (though, like any other venue) not in combination with other offers. And the non signature take AAA for a 20% discount. TiW automatically adds 18% tip, AAA does not.