Cheap, highly rated booster seat at its lowest-ever price

Is the Graco Junior Maxi i-Size R129 Highback Booster worth buying? Yes — at £34.99, with a 4.7/5 rating from 2,830 reviews and 2,000+ bought last month, it looks like one of the best-value highback boosters currently available.

First impressions

The appeal here is immediate: this is a lightweight highback booster for children from 100-150cm, roughly 3.5 to 12 years old, and it costs just £34.99. That matters for UK families who need a second seat, a grandparent-friendly option, or a budget replacement without stretching to the £71.99 CBX by CYBEX Solution XI-Fix. The Midnight fashion version also comes with cupholders, which is a practical touch for school runs, longer trips, and keeping drinks from rolling around the car.

What does the Junior Maxi R129 actually offer?

The main selling point is the R129 highback booster format, which uses open-loop belt guides to help position the adult seat belt properly across the child. For families moving on from a harness seat, that belt routing support is important because it helps the seat belt sit more naturally across the shoulder and lap. The 10-position height-adjustable headrest is another key feature: it lets the seat grow with the child and should reduce the need to replace it too early.

The soft cushioned seatpad should make it more comfortable for everyday use, and the retractable cupholders are a useful extra rather than a gimmick. Graco also says the cover is machine washable, which is a genuine benefit for UK family life where snacks, muddy shoes and spilled drinks are part of the reality. The product description also says it has been rigorously tested to meet or exceed applicable standards, which will matter to parents prioritising safety compliance.

How does it perform in daily use?

Based on the feature set, this seat is designed to be straightforward rather than complicated. The lightweight design should make it easier to move between cars than bulkier ISOFIX seats, and that can be a big plus for shared custody, grandparents, or families with more than one vehicle. The one-hand headrest adjustment is especially useful because children grow quickly and a seat that is easy to adjust is more likely to be kept in the correct position.

The open-loop belt guides are one of the most important practical details. On a booster, proper belt placement is the whole point, so anything that helps guide the belt correctly is valuable. The trade-off is that this is still a highback booster rather than a more heavily engineered ISOFIX model, so buyers who want a fixed-in-place seat may prefer the CBX by CYBEX Solution XI-Fix at £71.99. The Graco is more about value and simplicity than premium hardware.

Is it good value for money?

At £34.99, yes. The current price is the all-time lowest, and the price data shows it has not been cheaper than this. That makes the timing unusually good, especially because the average price is also £34.99, so you are not paying a premium to buy now. Compared with the Graco Pink Fashion version at £40.00, this Midnight version is cheaper while keeping the same 4.7★ rating.

Against the Kinderkraft I-Spark I-Size at £39.90 and the CBX by CYBEX Solution XI-Fix at £71.99, the Junior Maxi R129 lands in the budget end of the market while still carrying a strong user score. For UK buyers watching costs, that combination of low price, high rating and strong sales momentum is hard to ignore.

What are the drawbacks?

The biggest limitation is that this is a basic booster seat, so it does not offer the extra installation security or premium feel of more expensive alternatives. It also only comes in three variations, which limits choice if you need a specific colour or setup. Another practical warning is that a booster seat depends on the car seat belt fitting the child properly, so it is only suitable once your child is in the 100-150cm range.

How does it compare with alternatives?

The CBX by CYBEX Solution XI-Fix costs £71.99 and is aimed at the same 3-12 year, 100-150cm group, so the Graco undercuts it by a wide margin. The Kinderkraft I-Spark I-Size at £39.90 is closer on price, but the Graco still comes in cheaper and has the stronger sales signal with 2,000+ bought last month. If you want the simplest route to a well-reviewed booster at a very low price, Graco is the more compelling buy.

For UK families, this also makes sense from a practical point of view: a booster like this is easy to move between cars, simple to keep clean, and suitable for the age and height range many children reach after their main car seat years. It should also be easier to live with than a larger seat if you need room for other passengers or want to preserve boot space.

Final verdict

The Graco Junior Maxi i-Size R129 is worth buying if you want a cheap, well-reviewed booster seat with useful everyday features and a very strong price. It is less suitable if you want ISOFIX, premium materials, or a more heavily featured seat, but for £34.99 it delivers exactly what many families need without overspending.