My 3 year old daughter wants to go everywhere on "the bike seat" now. We travel a lot by bike, but our trailer just sits in the garage now...she loves being up high and up front where she can see. We talk a lot about what we are both seeing. She often says "I really like this." Total win at pretty much every level.
From a technical perspective, I have two comments. One, the engineering on this is excellent. No compromises, no complaints. Two, I wanted to share my experience as a shorter/smaller rider (167 cm/5'6"). I thought a lot about this before buying one; if you look closely, every photo you see (both promotional and otherwise) shows taller riders piloting the bike. Yes, if you're smaller you have to ride with your knees out, although flat pedals allow you to adjust your feet to make that less awkward. I don't think I would want to ride that way for 30 miles, but it's just fine for 10 or 15. Also, a dropper post makes getting on and off easier.