Ok, when I bought i thought it was the best thing I've ever bought in my whole life, baby loved the mattress, I loved the mattress (firm but comfortable) and he slept like never before (colicky baby)I loved being able to look at my baby and see him breath. I loved the fact that is was small and portable.BUT my baby outgrew it by the time he was 1 month and a half...and only 20 1/2 inches!!!as soon as he started to move around his bassinet, he got his head stuck in one of the sides of the co-sleeper perpendicular to his body ( i though he had broken his neck!!)I exchanged it for the Original version of this co-sleeper and I love it again..it is not portable as the mini, does not have wheels, it is not as eady to assemble, and definitely not light, but my baby still loves it, the mattress is still awesome and my baby sleeps through the night and he is only 3 months...