UPDATE*:-I delay product reviews until i have a chance to thoroughly test.-Criteria: EZ to install & use, (no heavy lifting or bending, least muck to clean, low maint, durability, and then a versatile use design-I Got these 2 mo ago & gotta say, this is the best design I've found for versatility of coops or field use.—Super EZ to instal (only tool a drill & bit, took less than 5min on my first completed unit),—keeps the water reservoir clean, birds cannot contaminate—the cups are float valves, auto- filling with use.—*I gave Less stars for the cleaning only bc i hadn't figured out how to tip/pivot the cups (ididnt kno yet), w/out lifting the bucket BUT ITS REALLY EZ (i feel stupid 4 not trying B4 reviewing): just pivot cup in place and swish out w/extra water bottle on hand and fingers (reset cup upright asap, since releases water while pivoted)—once mounted in position either onto a raised bucket (my first set-up: 3 cups mounted onto a 5G lidded bucket I set on 3-4 bricks on the ground, but it can also be hung by the handle—OR—in a line on pvc pipes).—These are sturdy, with no small parts like nipples that can easily break (beaks are hard & strong)—birds take to them fast, no “training“ involved-the water is right there for them to see & reach—on hot days, i add a recycled 2L soda bottle of frozen water, keeps cool all day (swapped out daily)—I Plan to order more for my 6-bay breeding coop: pvc pipe will run along the coop stringers from my indoor cistern (an abs garbage can with bulkheads/bibs applied to both sides for attaching the pipe runs: i’m using 3” sections of 2”Dia pipe coupled onto longer pipes so i can reach & tighten wingnut/o-ring/washer assy inside—total cost for this setup b4 water cups abt $35), then i can choose cup placement—i like to support companies in the USA, this is an added plus: Made in USA