It pretty much does what it's suppose to do; heat water. This water heater replaced an older one of the same design. Install went as expected but could have been so much more simple and quick had the manufacturer included a few more inches of hoses.
Working under the sink is cramped and trying to stretch the hoses from the faucet to the actual heater was at times, a challenge. Another install issue is getting the wing nut that holds the faucet in place behind the sink to thread properly. I cut a slot on a piece of 1/2 metal conduit to hold the wing nut in place and thread it onto the faucet. It would be nice if the manufacturer included some sort of plastic/nylon tube to facilitate an easier installation.