Product review (4 stars): Very good for the money and size.
First thing that comes to mind., small, and powerful,
Easy to install, well built. more importantly, it does not show any signs of rust inside
Previously I had a Badger unit, it lasted many years but the inside started rusting after just one year, had to "treat" regularly to keep it going. This one does not seem to have that problem so far.
Took one star off because when there is a lot of water in the sink, the unit starts vibrating  brutally (it seem to resonate) and the vibrations are so strong that it might tear the drain pipes apart (it happened twice so I had to secure them with a sealant). Part of the problem is that the drain orifice is smaller than standard (significantly smaller than the Badger) and there might be a cavitation effect.