I tried it a couple of times. It is OK, but certainly not "the best".Waterborne ceiling paint from Benjamin Moore is by far the best!
General Paint breeze interior flat was always my go-to. Cheaper than BM's ceiling paint, and at the end of the day, had less witness lines. Cloverdale has a great ceiling flat as well, though I haven'd used it enough to form an overall opinion on it. We've tried SW promar 400 a couple of times, though I was never happy with the results.
Glidden ultra worked well for us on one project. I haven't had the opportunity to try it again since.
I think every paint manufacturer has at least one great line for ceilings. It's just a matter of finding what works for you.