I purchased the Angel Dear blankie for my son when he was about 5 months old. I wanted to get him a lovey that was lightweight enough for him to sleep with without my having to worry about it being a SIDs risk. I know that the advice is to wait until a year old before putting anything in the crib with your baby, but he was having trouble adjusting to sleeping with his arms not swaddled (and swaddling is also a SIDS risk once your baby can roll over).
This blankie was a major help in teaching my son to sleep with his arms unswaddled. Before we got it, he'd fall asleep with his arms out but wake himself up by flailing within 20 minutes or less. Hugging the blankie helped him have something to do with his arms and he was able to stay asleep longer without flailing and waking himself up.
The reasons I chose this blankie were the fact that it was so lightweight and the zillions of glowing reviews about it. As a first-time mom, I was still nervous about having anything in the crib with my little one, so at first I only gave it to him at the beginning of the night. When I went to bed, I'd sneak into his room and take it away. After a few weeks, I saw that he was capable of pulling it off of his face if it ended up there and felt reassured, and he's slept with it all night ever since.
We now have three of this blankie, one for his crib, one for the diaper bag, and a backup that we keep in his closet just in case. We rotate them all and wash them regularly.
He loved this blankie from the start, and would hug it while he slept at night. Up until about a month ago (when separation anxiety started in earnest), he mostly only used the blankie in the crib. Now at 11 months old, he wants to hold it sometimes when he is awake, too. He chews on the little nubs and will crawl around with it hanging from his mouth. When he sees the one we have in the diaper bag, he pulls it out and hugs it.
This blankie was definitely a great investment! I won't hesitate to purchase one (and a couple backups) for my next baby when he or she comes along.