I have in our Seat Alhambra (new model) mounted side by side two of these seats. In third seat MaxiCosi a baby car seat is fixed. The seats seem safe and sound. The installation of the first seat was very easy thanks Isofix. The second seat was not quite so easy because the child seat is very wide and pushes the already built-in seat side. I was able to offset the imbalance of seats by moving the car seats for the most part. Nevertheless, we are not spared creaking noise of the Styrofoam pieces. Unfortunately, the space problem exists with all well-known manufacturers of child safety seats. I do not understand why there are no seats with H-belts in these seats and price range. The fumbling with the car's own seat belts between the seats, in my opinion is not a good solution. Similarly I find the width of the head parts very strange. Love child seat developer! Lie down three times to infants and testing your developments in real operation for several months. I am sure that your products would be much more practical! Conclusion: We have opted for the seats for safety reasons (very positive reviews). Nevertheless me an H-belt would have preferred for our little ones. Handling I find very humble and great need of improvement. Criticism is not just to Storchenmühle, but to all child safety seat manufacturer!