Product review (4 stars): Works Very Well - Tricky To Install.
My original ice maker required three mounting screws - this unit only uses two. I am a contractor and I still found it to be tedious to mount and level despite an extensive collection of tools and experience. I will blame that mostly on Sub Zero - it's just an awkward spot to get to and the screws are not easy to access. Once hooked up, it started churning out ice cubes in less than an hour and the large tray was full in 24 hours. One suggestion -  I didn't use the shut off arm that came with the unit - I removed the original arm that came with my old ice maker and used that instead. The design of the old arm is better and fortunately, it mounts on the unit the same way. Works great...just like my old unit and I think the price is quite fair.