This is replacing the 21 year old InSinkErator that was installed when my house was built. It was used frequently and finally started to leak around the bottom. The new one works just as well as the old one, and I like that I can adjust the temperature of the water if I want. I hope this one serves me as long and faithfully as the old one did!
I did have a plumber install it, but that was mostly because he was already here to replace the kitchen faucet. In looking at the unit and the install process I am fairly certain I could have done it myself with little difficulty.