I think it varies from location to location on what response you get. For the BK e-cards their policy is that only certain locations accept e-gift cards. I know other Viggle members on FB had posted their problems with BK e-gift cards. Some even asked Viggle if they could be traded out for a different reward, and Viggle said no. So unfortunately you've stuck with the rewards you redeem.
As for Barnes and Noble, I took in 6 e-gift certificates and used them towards the purchase of a Nook cover...no problems. And I used a B&N coupon on top of that!
Best Buy: No problems here either. One of my e-cards had a little left on there, so the cashier wrote the remaining amount on the card, and gave it back to me to use on a future purchase.
Chilis: We just used 2 e-gift certificates last night. The waitress asked if they were gift cards. I said yes, and no problems.
Hollywood Movie Money: We have used these movie passes, even on opening weekends with no problems.
* My advice to anyone redeeming gift cards is to look up each company's policy regarding e-gift cards prior to redeeming. Sometimes e-cards have different restrictions than physical cards.
From the comments I've seen on FB, I get the feeling that some people think the policy for e-cards is Viggle's doing. I've seen women blame Viggle asking why they changed the e-card policy for Sephora.

This is not Viggle's doing. Each company, (including Sephora), is responsible for their policy on gift cards and can change them at any time.
diznee25