Bests & Worsts Reviews from Amazon

I bought this disposer over 3 months ago, but due to delays with kitchen cabinets delivery the installation had to wait until this past week. We have a cast-iron deep Kohler Deerfield sink, and my plumber was in charge of the installation. The EZ mount assembly was connected per instructions, yet the disposer would shake violently when turned on. We contacted Waste King tech support and were told that L-8000 EZ mount was not compatible with cast iron sinks of the type we had, and a 3 bolt mount system would work better (meaning purchasing a different model with a 3-bolt assembly). Mentioning the adapter kit, were told that there were no adapters or flanges were available to address the problem with a cast iron sink. I tried calling Amazon, explaining that even though it was past 90 days nowhere in the description did it say that L-8000 was not compatible with deep-well cast iron sinks. I was told I will only get back 20% of what I paid. I ended up purchasing a 3/4 HP KitchenAid Superba disposer with a 3-bolt mount and a steel connector to flange, which was a lot more substantial than the plastic EZ mount connector on the Waste King. It was connected and working in under 30 mins. The plastic connecting parts was another reason I felt uneasy about L-8000 or other Waste King disposers, despite the longer warranty. Excepting the more expensive batch-feed Waste King disposers, most had an all-plastic neck mount construction when it seemed stainless steel would have been a better (although more expensive) choice. I was swayed by the overwhelmingly positive reviews of this model, which for all I know may be deserved, plastic parts or not. Amazon and Waste King should do a much better job stating clearly that the L-8000 is not intended to be used with deep-well cast iron sinks. EDIT: After I wrote to Amazon, the rep graciously allowed to return the item for a full refund. 5 stars for Amazon standing by their warehouse-deals affiliate and reputation as a reliable vendor.