I love how Haiku feels like it has its feet in two places at once. That it is both in the year 2000 and 2040 at the same time.
It does feel a lot more user ready than a lot of alternatives. Although I did find it funny that on their last release a big milestone is that it can now compile code a little faster than half the speed of Linux. So performance is still lacking but gaining. Considering their team size compared with Linux, that is a big achievement.