We just started using the Merlin suit for our 4 months DS. It works great for overnight. For naps, we have to put him down in the Merlin suit before he gets overtired. Once he gets cranky, he would fight sleep no matter what. From my observations, it does not keep the baby from moving--DS still moves his arms, sucks his fingers, kicks his legs, and shake his heads. I actually looked at the patent directed to this suit, and the idea is, as stated in the patent claim, "configured to provide weighted pressure to at least one proprioceptive target point of an infant's body to reduce neurological reflective twitching or habitual waking patterns of an infant, thereby improving the quality and duration of sleep of the infant when sleeping in a supine position." It does not necessarily mean to inhibit body movements like swaddles.
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