very easy to replace an original instahot from 1999. Original wall bracket was compatible with new unit. The new quick connects to the tank worked easy, no leaks. The faucet "clamp" under the counter is simply a threaded rod with a standard screwdriver slot, so no more trying to get a wrench up behind the sink bowl.
While all installs are different, the copper tube did not come with any fittings. A brass nut with compression sleeve was all I was missing, so only one trip back to the hardware store. Insinkerator could probably toss a few connection fittings in the box and charge another 5 bucks.