I ordered a couple of these for DS and he doesn't seem to like them so far, since the swaddle is so much looser than his Miracle Blanket and he can still bat at his face.
Did you have to get LO used to being in the Woombie for a few nights? Or swaddle on top of the Woombie for a bit? Maybe he's just not ready for that much freedom while he sleeps!

Re: Woombie users
My DS hated these... I tried and tried but they never worked for us.
GL!