Ciao Jeanette! I have it and had been using it with both the isofix base and not. Of course with the base is much more stable and comfy (as you only click it in) but in one of the cars l didn't have the isofix so used it backwards with the seatbelts. My only suggestion is to really tight as much as possible them and readjust when baby is on it. It didn't look so unstable to me once baby was on it!
@Sophie yes, I followed the official Maxi-Cosi installation video, but they don’t show how to check that it’s secure. 😅
@Ale thanks for sharing your experience! We didn’t put the baby in when we tried installing since we weren’t comfortable driving with him in it the way it looked and also didn’t want to set him off crying by putting him into the seat when not going out. 😅 We’ll have to see how that looks in comparison! From the way the seatbelt secured the seat, it seems like we actually have to have our baby already in the chair before securing. Was that your experience the time you traveled without the base or were you able to set up the chair then put your baby in?
Yes in both cases it's much easier first you put the child in the seat, tight the "ropes" and then you install it with the seatbelt (or in the base). We tried sometimes by First putting the car seat and then sliding her in but it got even more difficult to adjust it In a good way
Have you seen whether there’s a YouTube video on how to install with the seatbelt?