X.O.
I am a swaddling pro. I have so many different types of swaddles--Kidoppatomus, Sleep Sack, Aden + Anais, and brands I don't even remember. My new hands down favorite is the Woombie--it is incredibly easy, and there's no way he's breaking out of it.
My son is now 4 mos and he is sleeping even better in the Woombie. Basically, it looks like a zip-up pea pod. I can't tell you how wonderful it is--even my husband can zip it up without any issues. Last night my son slept 16 hrs straight in that thing. I'm now using the other swaddlers as my back-up for when his Woombies are in the laundry.
(ETA - my kids like to be swaddled for a long time--usually about 6 mos)