I put "vs" because it was a bit of a struggle. We bought a very highly rated rear facing infant car seat for our newborn (1st baby. Boy. 7lb. 1oz. 21in. 8/27/09@6:18pm Yes I'm proud!). We all leave the hospital today (I'm stealing their wifi), so I just installed the car seat (I know, last minute, but the baby came early). Wow. I don't know if it's just the carseat we bought, but it BARELY fits in the back seat of the car. I had to put the passenger seat all the way forward and tilt it almost straight up and down. How do people fit these things into anything but a hummer? Lol. The back seat of the prius is by no means small, so I'm surprised how tight a baby seat fits in there. Is it just the brand we bought, or have others had the same issue with the tight fit? On another note, the LATCH system is very easy to use.