When looking at decoys, you want to look for durability in them. Your decoys take abuse from being tossed in the back of your truck, to sitting in the water and sunlight day after day. Finding ones that can live up to the abuse season after season is important. Molded plastic is the best choice for durability, even though they are bulky and heavy they will outlast any other type of decoy. Other durability to look for is the paint job, if you can see a scratch in the paint so will the duck before it even flies overhead. Some decoys have the UV protection that will add years that you can get out of them. Make sure you don't underestimate how quickly the colors will faded out with the use of the decoys.
Second thing to look for in decoys, is the realism they have. Waterfowl have eyesight ten times better than yours. If you can detect a flaw there is a good chance that the ducks you are trying to come in will too. When looking at decoys, the best decoys should not only look realistic to you but to the bird's eye as well. Make sure you are looking at decoys that hides the transition lines and brings all these components together. Last thing to making realism happen is the different flock positions. You want to make sure you don't buy a pack of decoys that are all in the same position and are smaller in size then in real life, most likely you will not have many ducks fly over. Waterfowl are smart, have the flock mentality and they need a little coaxing to fly over.
Last thing to look for in decoys, is the portability. You need to buy decoys that are able to be set up and taken down quickly and this is due to changes in patterns. Where you might be successful one day but might not be the next day. The molded plastic are heavy and bulky but that doesn't mean they can't be taken down in a short amount of time. Some hunters would recommend having a couple different types of decoys as it gives your decoy spread resemblance of a real flock and makes moving around a little less stressful. They also believe that plastic hard molded decoys to be the best resilience when it comes to duck hunting.
With these tips in what to look for when buying decoys, you don't have to worry about spending an arm and leg for the best. Even the cheap decoys have the same and sometimes are better than the really expensive decoys. Also keep in mind that what works today may not work tomorrow. You need to stay on your feet and keep in mind to adapt to any given situation, the hunting will work in the hunters favor. With this awesome tips, you will be able to find some decoys that will be a great addition to your spread and keep your duck hunting good.