Looking at the reviews for this on their own website, it uses top tether to secure it which people say makes it difficult to spin, particularly in the forward facing mode with harness. That sounds like the tether attaches to the top of the seat, which is not ideal for a rear facing seat anyway. It's OK and it will meet the correct safety standard, but you can get better seats for the same money.
For this budget I would look at Joie 360 Spin instead, it's a much better rated seat and doesn't have the top tether issue. Or Graco Turn2Me i-size, which is similar but has better side impact protection, and a 19.5kg weight limit which is similar to the Cosatto one.
Neither of them have the high back booster mode up to 150cm built in, but that's best to buy separately anyway, when your child gets to that age/stage.
And, I know the Cosatto seats have cool covers (I really like their patterns) but I would prioritise safety and maybe look at something like an Aeromoov insert to reduce sweating in the seat in the summer, or a fun patterned blanket to keep in the car for the winter, since they shouldn't wear coats in a car seat.