With two architects in the house, we were hard pressed to find an affordable, modern crib. I was so happy to have found this great looking crib at such a reasonable price. I've never bought anything from WalMart before and was pretty nervous regarding the quality. We've been using it for 6 months now. It took me about 1.5 hours to put it together but needed help towards the end just having someone hold the pieces to get them together. But it was easy and straight forward. Once it was together, I couldn't be happier with the quality and stable construction. It is not a drop rail crib, so the overall height of the crib will probably be lower than what you are used to. I am 5'-6" and the height is comfortable to me. I like the lower profile of this crib as other cribs just seem huge to me, for some reason. Which was a plus in our smaller size nursery. In regards to the mattress: We bought the Sealy Ultra Rest and it fits tight. So tight that I have to sort of lift the matress up to put the sheets on. I wish we would have gotten a smaller mattress by Simmons. And, looking at the dimensions for the Serta mattress, I think it might be too big for this crib. I am so super happy to have purchased this crib. I could not be happier with this affordable, modern crib.