Love this seat, and so does my son. He's 4 but big for his age (46" tall and 48lbs) and has been asking for a big kid car seat once his friends started to turn 4. We had a Britax toddler seat with a 5pt harness, but also needed to give that up for the little sis, so it was clearly time to move on. I read a ton of reviews, both official safety reviews and parent feedback, and decided on this for the following reasons:1. The high back and headrest are more comfortable for him. If he falls asleep in the car his head stays upright and he doesn't slump to any side.2. The car seat can recline when latched and used with a reclining seat (which we don't have, yet, but will if my husband ever gets his way and we buy a minivan)3. The headrest is just as easily adjusted as my car headrest, and this positions the seatbelt properly across his shoulder and not neck. This is way less complicated than the strap that comes with some of the booster only options.4. This thing is SOLID! It looks and feels like a real seat and not something that my kid could destroy if left alone with it for 5 minutes.5. The fabric feels nice, key for hot summers in PA, and claims to be stain resistant.6. I think the thing looks great - clean and unfussy with a great color selection.7. It comes with a cup holder. Now I know that some come with TWO, but come on, my 4 year old is super excited to have even one. Most of the time it is filled with hot wheels or playmobile figures, but he loves having a place to put his very important stuff.8. He can now buckle himself in and do it correctly without any help from me, something he and I both love.9. This booster is expensive but lasts for 9 years, so we'll def be using it for child number two (who isn't nearly as big as the bro and will thankfully take longer to grow out of the 5pt)The only detractors I can see are, well, nothing. All my friends claim to envy this car seat and are buying one when their kid is ready to move out of the 5pt.