My DH and I got the Disney Costco package for the Swan and Dolphin last September, and we thought it was great! With Swan and Dolphin, you get the extra magic hours which we used with no problem. We were guaranteed a resort view at Dolphin through Costco's package, which we definitely got! We could see both Epcot and DHS from our hotel windows. The room was great and it was super easy to get the park tickets at the service desk in downtown Disney. When we priced it out, it was the best option for us. We arranged transportation on our own so we could have the complimentary stop at Publix to pick up some small snack and drink items, but you can add on a ground transportation option.
Also, when one of our flights changed, a Costco Travel representative called me up to make sure that I could choose a new flight that I was happy with. We didn't have any problems with our package and we would definitely purchase through Costco again!