I use it on my old laptop Samsung N150. It used to run smooth, but recently it started working slow and there are many errors. I like Haiku as it fills the gap between high performance but non-user friendly OS and sluggish but user friendly. I would be so happy if it would get more popular.
At the same time, I hate MS, especially their support, so much, that I would do everything to stop using their products.
Unfortunately, Haiku is still too unstable to use it as a daily driver and has too many bugs.