Diono Radian 3 RXT Review

We were supplied with a Diono Radian 3 RXT for review purposes. This post is not sponsored and, as always, all opinions shared are our own.

Our youngest, Mairi, was overdue for a new carseat. While still within the age range of safety, her old seat was well used. It was a hand-me-down from her two older brothers and after five solid years of use, was due for replacement. I say this because while still structurally sound, technology has advanced so much since then. Also, compared to her new Diono Radian 3 RXT her old one was basically just a plastic shell with straps (sounds super safe, right?).


Out of the Box/First Impression

After unpacking, the first thing that impressed me about the Radian 3 RXT was the weight of the carseat. It’s really solid and heavy. The technical construction involves “automotive high strength steel and an engineered dual spine”, but as a parent, what I saw and felt was simply, safety. Construction wise, compared to our previous seat, there was no competition. Another thing I noted right away was the storing feature of the seat. It folds up and is conveniently secured with the built-in strap. This will no doubt come in handy when we fly for travel.

First Installation

Setting up the Radian 3 RXT certainly took more time than simply adjusting the straps of our old one. Not reading or skipping through the manual simply isn’t an option. I read through all of the instructions thoroughly. It wasn’t complicated, but it did take about 20 minutes to get the carseat properly set-up and another 15(ish) to install it in our van. While a bit unexpected, this actually provided assurance of the safety and care in construction. It warrants noting that the SuperLATCH feature was really helpful in securing the connectors of the seat to the anchors in our vehicle. There’s an audible click when they connect and a visual indicator; taking the guess out of whether the seat is properly secured.

Child’s Impression

First comment made by our daughter was about loving the plum colour of her new seat. Compared to the old black one, this was a major upgrade. Then of course, she needed to try it out. Her first comment was about how comfortable it is - this is due to the memory foam seat. The straps also come with optional comfort guards.

Mairi has now been riding in style for the last few weeks. She sits up higher and is notably more snug, supported and comfortable in her seat. The convenient cup holder has come in handy as well as the generous head rest in supporting her neck when she has fallen asleep in her seat.

Favourite Features

  • My only regretrally an all-in-one carseat, serviceable from to 120lbs

  • No additional products require purchasing. The Radian 3 RXT comes with a supportive infant insert and cup holder

  • Overall stylish design

  • It allows for extended rear-facing (up to 50lbs)

  • Narrow, sleek design provides the ability to put three Radian 3 RXT carseats across most mid-sized vehicles

  • The Radian 3 RXT is FAA approved and folds up to a compact size for easy and convenient travel

  • It is built exceptionally well (super side impact protection, aluminum reinforcement, Safe Stop harness, rear-facing tether and more)


The only thing I will add, which isn’t a complaint, is that we won't be moving the Radian 3 RXT around. Given that I know it’s properly installed now and the time required to this, it’s not practical to uninstall/install it for short trips. For example, when grandparents are taking Mairi for a short trip, we’ll use the old carseat. I suspect other owners of the Radian 3 RXT will feel the same.

The only regret I have is that we didn’t go with a Diono when purchasing for our first child!


If you have any questions about the Diono Radian 3 RXT, please feel encouraged to leave a comment and I will reply right away!