The Veer has been great for our almost 3 and 5 year old. I wish I would have gotten it instead of a stroller for our walking-focused, day-to-day activities.
Our three year old still naps, and we bought this kit because he was flopping around when he got tired, which is a downside from having a stroller. I agree that the mattress included is pretty useless. But the kit itself to flatten the bottom is sturdy and folds up small. With your own blanket, it’s perfect for the sleeping toddler. I don’t know how even a baby would sleep on the included mattress. It balls up pretty quickly.