I looked at one at the dealer's recently and I've seen a few on the road.
Stunning appearance when looking at it on the road.
But up close, it has less cargo capacity than my X3, especially lower in height at the tailgate. So I can't carry my bicycle as easily. And it doesn't have the ground clearance of my X3 to go offroad.
The salesman at the dealership said it's basically a new way of selling a station wagon. The 3 series station wagons apparently don't sell well, so the X1 appeals to people who would "never" buy a station wagon.
BTW I like the looks of the X6 too, that's a design. that provokes a lot of disagreement. But the X3 is much more practical for my needs.