My experience is mixed. A good number of animals I got from DD came in great and never caused any problems.
But I also had quite a few DOAs with fish, DOAs with shrimp and crabs because they were crushed to death by large gravel pieces in their specimen containers, fish that arrived in poor condition, and a Red Sea regal angel that wouldn't eat and ultimately died. All the problems may have been due to shipping, especially the DOAs, but that was ultimately DD's fault due to improper packing, adding too many ice packs in the summer so that the fish froze to death in the box,...
Not necessarily financial losses, but quite frustrating.