I just looked up these mattresses and that's a really good idea! I actually want one, but I can't afford $599 for a mattress, sigh!! If you can afford it, go for it. They look awesome and much safer than the norm.
My boy has a $90 cot mattress from target. It's very comfy and firm and does the trick! But hey like I said if you can afford it, get one! I would! Seems very practical for when baby decides they what to roll over n tummy sleep. Because at around 5-6 months, most babys do. My boy is just doing that now, I'm too scared to let him stay on his tummy so I roll him back over once he's in a deep sleep smile