Merlin sleepsuit opinions?

Da

Has anyone used the Merlin sleep suit and did it work for them? My DS is only 3 weeks old but I am looking for something to help him back sleep. He hates being swaddled traditionally, I have tried the sleep sack swaddle and he always gets his hands out and the fabric over his mouth. He can be fast asleep and the moment I try to set him down the startle reflex wakes him. If I do put him in his back he will roll into his side.