Love being able to get hot water for tea so easily. I also use this when I am making pasta or another dish which requires hot water - it cuts way down on the cooking time!
I only have two complaints :
The product is kind of noisy - you can hear it from the other room when the water is heating up. 
Installation was difficult because the tubing was not long enough that came with the kit and we had to install a new plug under the sink. The garbage disposal is plugged in to the plug under the sink and is set to go on and off with the garbage disposal switch above the counter.