https://www.reddit.com/r/AITechReport/comments/1e0vqh4/chicco_nextfit_zip_convertible_car_seat_review/

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We used the chicco nextfit zip (only difference seems to be weight limit for rear facing from the max. I wish they had had the max at the time!) for years. We loved it. Never really had a problem getting our child in and out, though I'd say after a couple years the straps didn't move as well as when they were new. We only noticed because we ended up with replacing both seats we had with the same models because people kept crashing into our car (seriously... Like 3 not our fault at all accidents), so insurance replaced them. We did end up recently replacing them with the chicco myfit (converts to booster) because it was a little hard to buckle and unbuckle our oldest super fast and have her climb out on her own in the school drop off line. But under normal time limits when a line of impatient parents aren't waiting behind you, I didn't find it hard to do! If you ever travel though, buy a cheaper light weight seat for travel. The nextfit is super heavy! Makes it easy to install (my husband has said all the chicco ones are really easy to install), but you don't want to carry it thru the airport! More on reddit.com

We bought this for my husband’s car before my son was born nd I absolutely love it! I really don’t think you could go wrong! Just my two cents. When my son turned one we bought a Graco convertible that is great for the price but I like the Chicco next fit zip better. My son likes both of them FWIW. More on reddit.com

You’re using the lower anchors to keep it in the car, but then putting the seatbelt through the belt guides to buckle up your nephew? At his age a booster is safe unless he has a medical reason, and at 65 pounds he’s outgrown the harness. So you’ll just use the seatbelt over it. It doesn’t need less than 1” of movement at the belt path. The lower anchors just need to be snug. More on reddit.com