I bought three of these feeders this spring and am very pleased with them. I read several negative reviews of these feeders but have not seen anything like that so far. The feeder is wider (2”) vs. 1 3/8” for my wooden frames but fits snuggly in my standard Langstroth hive. The length is exactly the same as my wooden frames (19”). So I just replace one of my wooden frames when I insert this feeder. As for drown bees, I haven’t had any. These feeders have a ladder of sorts and the bees climb them quite easily. When I refill with sugar syrup, invariably a bee or two down inside the feeder are caught off-guard and end up floating on a rising tide of liquid syrup. Once I stop pouring they regain their footing on the ladder and climb out of the feeder. You can fill over 1 1/2 gallons of syrup into these feeders so the interval between refills is several days. The feeder top and ladders come as one piece and although there are no instructions included, it is very easy to figure out how to fold up and snap the top onto the feeder body. The plastic is reasonably thick and flexible, not brittle. As I said, I haven’t experienced any of the negative aspects other reviewers have experienced. Maybe these have been redesigned.

Didn't come with any instructions, but it wasn't hard to figure out how to put it together. Seems to be a decent quality feeder.