DD2 loves her swaddle. The only trouble is, I do it using a muslin square & NO-ONE else can do the bloddy thing. DH tried so many times with DD1, he know's the theory (he recently explained to SIL how to do it!) but just hasn't got the knack of making it stay in place & so is paranoid about it coming undone.
So, if you swaddle, what do you use? We tried a miracle blanket type thing with DD1 but didn't get on with it (can't remember exactly why - something to do with the bit you put their feet in... Must find it & try it with with DD2). I bought a woombie last week, which looks fabulously easy, but it's too stretchy, I don't think DD2 likes being able to move! 
And if you don't swaddle - how on earth do you get them to sleep without hitting themselves in the face?!