Very good, works the way it is designed to work.
I've not been able to use the product yet but first indications is the product is well built and will function well.
The inside of the lid rusted in just a few days. Something that needs to be fixed otherwise folks can just recycle old jam jar lids.
Two fit easily into one of my top bar hive.
One feeder did not fit opening. Also suggest making a half gallon feeder. My bees consume a half gallon of sugar water per day. Larger capacity would help.