We purchased a 2013 Entertainment Book to use on our Christmas 2012 and August 2013 trips. When we heard the company had gone bankrupt, I emailed or posted on Facebook to each of the businesses with whom we planned to use a coupon this summer to ask if they would still honour the offers. Every single business (approximately 8 in total) affirmed that yes, they would honour the coupons as printed.
To answer the OP's question........
If you are staying onsite at Disney and Universal and don't have a rental vehicle, I think the book will be largely useless to you. A couple of DTD food establishments are in there (T-Rex is one) but that's about it.
We get a lot of value from it, as we are devoted offsiters who always rent a vehicle, so we can take advantage of the car rental coupons (saving us $25 on each rental), the mini-golf offers (all buy one admission get one free), the discounted or BOGO attraction offers (Gatorland, Boggy Creek Airboats, Showcase of Citrus monster truck tour, Titanic The Experience, etc.), and the food discounts (Giordano's Pizza, Friendly's, Dunkin Donuts, Dairy Queen, Popeyes, etc.).