Everything about this sleeper is great except for one major flaw. It's not perfectly level. I can only assume it drops ever so slightly due to the angular design. The problem with this is that coupled with the slick surface of the mat, my baby slides all the way to the side every night. Without fail, over the period of a couple hours she will eventually slide to the side closest to the bed with her face against the netting. Because of the breathability of the netting, she is safe. However I have woken up to her having abrasions on her nose, I'm guessing from rubbing on the netting. All that said, I have added support to the feet that go under the bed so that the sleeper is level, but this is something to consider.