very disappointed, unusable

I bought this seat because it seemed to be the best in terms of safety and comfort. Indeed, it seems very comfortable seat, it is adaptable everywhere, adjustable and the child is fine. The problem, not least is that with its home system, I have to mount the seat of very high bike, too high. When I'm in the saddle, my feet are off the ground with the weight of the seat and the child in the back, it's too dangerous. My spouse is doing better but we are not at all comfortable.
We tested the seat on two different bikes but the problem is the same. I'll have to buy another seat