Opinions on HALO Swaddling blanket?

My son is 4 months old & for most of his young life, he has taken every nap & bedtime in an infant swing. After his 4 month checkup Monday at which the doctor said I could sleep train him, I have been putting him in his crib to sleep. He does well with very little crying (I was afraid he might not sleep without motion) but the problem is he HAS to be swaddled. He squirms & startles himself awake if he isn't. But he's teething so he constantly wants his hands in his mouth, so no matter how tight I swaddle him, he gets them up, loosens the blanket & wakes up crying. So I want to know if anybody has used the HALO blankets or the Miracle Blanket (I think it's called that) & if you have, did they work or did you like them? I want to know if I'll get my money's worth before I buy one.