It actually saddens me that I cant give this sleepsuit 5 stars, because it is amazing.  It could be, and it should be 5 stars, but unfortunately the sizing is SO inconsistent, I had to knock one off.
That said...  I am extremely grateful for finding this sleepsuit, because it has truly been a god send.
We didn't know how to transition our three month old from his rocking, vibrating bassinet (another god send for his first few months) to his crib, since he would flail around and scream and cry after only a few minutes.  After doing some research and reading the reviews, I decided it was worth a shot.  Since we didn't really swaddle him, and he was used to a smaller, more confined space (bassinet), the sleep suit made perfect sense (read the manufacturers description for reference, its 100% true).
We put him down in the bassinet (in his regular jammies) around 6:30-7p, and wake him around 9:30-10p for his last feeding.  Change, eat, change, then we put him in his sleepsuit and into the crib he goes.  And hes out like a light.  Hes even sleeping in longer (7:00a as opposed to 4:45-5a).
I ended up getting three more after the first size small, another smalls and two larges (since they cant be dried - hang dry only).  The blue and yellow are smalls (top), the blue and cream are larges (bottom).  Theres a SIGNIFICANT difference in the exact same sizes.  Which isn't a HUGE problem for us.. its more like we have small, medium and large.. but it is definitely worth noting, in my opinion, because it could pose an issue for some.
Regardless, I still HIGHLY recommend, Im VERY happy we found this, and I hope this helps parents looking for a legit sleep solution.