We liked this carseat because the sides were low enough to more easily put an 18 month old in and out and its more narrow than our other carseat that we are using with it. We're pleased. It was a good choice for us.

Ater doing a lot of research, I chose the radian r100 for a cross country flight because it is narrow enough to be wheeled down an airplane aisle (even the small Embraer jet we took for a regional flight from newark to Toronto), when strapped to the britax travel cart (basically a luggage cart onto which you attach a convertibe Carseat using LATCH clips). The last thing I wanted to do was carry a heavy, bulky carseat down an airplane aisle while waiting for people to finish stowing things in the overhead compartments. It was unbelievably easy to install in the airplane forward facing. it has a very tall shell (so your child won't outgrow it as quickly as he would outgrow other carseats), so it is difficult to install rear facing unless you buy the $10 Angle Adjuster (big square of foam). The R100 is sturdily built, extremely safe with a steel alloy frame and has a low profile, so it is easier to get my baby into and out of this seat compared to our Britax Pavilion (which has a high built in base). I ended up making the Radian the primary carseat and putting the Pavilion in my husband's car.

This is a great seat, feels very sturdy and safe for our daughter. Easy to install, easy for travel, and with some minor adjustments I can use as a harnessed seat for all three of my children, ranging in age from 14mo to 6yrs. :) would purchase again if I needed another.