I have installed the Coccoro in a small Honda (2011 Insight) using LATCH and the belt (both lap and shoulder and lap portion only). I prefer installing with the belt.
I also prefer installing the seat outboard. The female end of the buckle for the center seat is slightly raised from the bight and has to be twisted so that it doesn't butt up against the belt path.
Having said that, after some practice, the seat is a pretty easy install in my car. I like the open belt path - it doesn't kill my knuckles like the Radian. Also, the whole being tiny and light thing makes it much easier to maneuver in a small backseat.
I love how tiny the seat is. No one has to have their knees in the dash
I have two in the car (plus a Radian) - they will last through the end of my lease, and then I'll buy bigger RF seats for the new car. My girls are about 31", 23lb, and almost 2y old. They have a few inches above their heads. I am pretty sure they'll hit the 1" rule before the 36" limit, but they carry more of their height in their torsos than their legs.
It's still easy to load and unload them, and I actually really like the puzzle buckle. The harness is easy to tighten.
*posted using the car-seat.org app*