We came back for a second one of these when we needed 2 cribs.  The babies seem to like them, but once you flip it to the softer toddler side they REALLY like them.  :)  We've owned one for over 2 years and the other for about a year.  Both are still like new - no sinking spots or lumps.  I think the packaging needs to be a bit better from Wayfair because our first one showed up with some dirt on it.  They are really heavy mattresses so it you lift out the mattress to change the crib sheet like I do, be prepared for a workout.