nuroo swaddler

Adrienne
Anyone use this? We got one for our shower and I thought it could help with transitioning our baby to his crib. It's supposedly more safe than a blanket and "impossible" to fasten to loose or too tight, but I'm finding that to not be true. 
No matter how snug or low I fasten it my baby ends up wiggling it up into his face and awake pretty quickly. Is it possible I'm missing some instruction on how to use it properly? At this point I'm pretty annoyed and scared to use it. Might go by a swaddling sleep sack to replace it.