This product was somewhat easy to install. The one glitch was that the plastic "nut" that was provided to tighten the tailpipe under the sink to hold the thing in place was too large in diameter for the hole in my granite counter, where the last instant hot device had been. I had to grind off the knuckles of the plastic nut so that it would be smaller in diameter, so that I could tighten it, to hold the dispenser in place.. 

I also had to remove the garbage disposal (and several drain pipes) in order to have room to install the instant hot unit. That actually took more time than installing the unit.

My long term concern is that the device has a clear plastic hose (about 2" long) that connects the hot water coming out of the unit to the 3/8"copper pipe that goes up to the dispenser on top of the sink. I suspect that this plastic will harden, crack, and leak over time because of the very hot water passing through it.