I have the Ultimate 4 Pak Flock. The decoys are about what you would expect for the price. From a distance, they look good. Up close? Not so much. The durability is pretty good, for inflatables. The stakes are adjustable so you can allow them to move in soft breeze or immobilize them in windier conditions.
They helped bring down two birds last year, one for me and one for my friend. My friend also took out one of the dekes with several stray pellets from his Ithaca 16 GA. It comes with a repair kit, but that poor deke was peppered, so it was retired.
Overall, I would recommend them. Very lightweight, very easily transported, easy set up, decent quality, great price. If you want realism, forget it. If you want basic dekes, yes.