Good Neighbor hotels are bookable through Disney Travel or Costco Travel. Both offer packages that are the same perks as the on site Disney resorts. Current perks are 4th night free, Magic Morning, Toon Town Madness, $20 Disney gift card and Lanyard pin set. Costco Travel adds a premium Character Meal for the same package price as Disney Travel.
Costco's Disney Good Neighbor deal isn't bad because of the added character meal. However, you have to pay rack rate for the hotels and a minimum 2 day Disney pass although you do get the 4th night free.
In comparing the best deal I could get booking by other means I found the Costco package a decent deal. It was priced about the same as booking hotel, passes and character meal seperate. So the Magic Morning, Toon Town and lanyards were a freebie perk.
For the hotel you are looking at you need to price everything out seperate and see if its a good deal. Sometimes it is, sometimes its not.