What are people saying about Zinsser ceiling paint and primer?

What people are saying about Zinsser ceiling paint and primer in reviews on Home Depot, Lowes, Amazon, and painter forums is generally very positive, especially for its stain blocking and one-coat coverage. Zinsser offers Zinsser Ceiling Paint, which is a low-odor, low spatter, bright white flat paint that includes primer in some formulations, and it is often praised for covering water stains, nicotine, and smoke stains without bleed-through, which many ceiling paints fail to do. Positive reviews mention it goes on slightly pink then dries to white, making it easy to see where you painted, dries quickly, low odor compared to oil-based primers, and covers yellowed ceilings and water rings in one to two coats. Users also like that it has good hide and does not require separate primer for many stains, saving time. Negative comments mention it is thicker than regular ceiling paint, can be harder to roll if not diluted slightly, and costs more at 30 to 45 dollars per gallon compared to basic ceiling paints at 20 to 30 dollars. Some users report it still needs second coat for severe stains, and recommend using Zinsser BIN shellac primer underneath for worst stains. Professional painters say Zinsser ceiling paint is better than generic ceiling paints for stain blocking and adhesion, but for perfect bright white without stains, some prefer Benjamin Moore Waterborne Ceiling Paint for ultimate whiteness. Overall sentiment is positive for stain-prone ceilings.