The BMW X1 seats are well known for being terrible. There is a lot of info regarding them out there on the internet. The following is just one of many forums where the seats come up for discussion. Type about the seat problem into the forum and you can read many more posts about the problem.
Not everyone is unhappy with them of course – but many are. It would appear the ‘sports seats’ are the only ones that are half decent.
As always with choosing a new car – best advice is always do your homework!