I read that Waste King has a fiber glass body and carries

Nobody would want to replace the garbage disposer every few years. I have gone through three InSinkErators since remodel of my house in 2000. Each time the ingenious mounting design kept me taking the shortcut - buying another ISE so I wouldn't have to remove the sink mount. However, there was a brand new one out of the box that was off-balance and noisy (thanks to Home Depot's easy exchange policy). This time, an ISE 444 gradually failed after six years, just two years after the the warranty expired! I just bought and installed an ISE Evolution Compact. It works well, very quiet.

With an engineer's curiosity, I opened the old unit up to find out why it was making such big vibration and noise. I thought there might be a stuck wood chip from my yard. Instead I found serious design issues that make it NOT TO LAST and prone to inconsistent quality.

1. Although the main chamber and grinding elements are made of stainless steel, there is a (non-stainless) steel piece attached to the underside of the bottom of the chamber (that spins). That piece will gradually rust out (falling apart after six years in my unit). Besides, there is no provision in the design to prevent water and particles from getting into the upper bearing, which also rusts.

These are TIMED BOMBS that will bring the machine down after certain time, and that's what happened to my ISE 444 (the rust out). They are things that are very easy to fix, and should have been fixed long time ago since ISE has gone through many years / generations. I can't explain why they were not fixed in the ISE 444 (manufactured in 2005). I guess I will find out in the Evolution Compact after it fails.

2. The two bearings that hold the motor shaft are aligned by a sheet metal body. If the body has a dent or if the machining tolerance is off, the shaft may suffer excessive wear and lose balance.

I read that Waste King has a fiber glass body and carries a ten year to lifetime mechanical and corrosion warranty (depending on the model). It appears that Waste King has solutions to address these issues. Too late for me now but I will definitely switch over if this Evolution Compact dies again in a few years.Two things caused me to only give it a four star; both are not related to the product itself. (1) The new unit did not come with the large diameter rubber washer that is supposed to go between the mounting fixture and the bottom of the sink. I have to re-use the one that came out of the old unit. The purpose of the washer is to provide padding so as to prevent damage to the sink when the three fixture bolts are tightened. I don't know why Insinkerator would skimp on something so inexpensive. (2) I did the installation myself. To raise the unit up so that the top is sufficiently up against the rubber opening, I had to use a scissor jack. The instruction manual should have included this as a suggestion.

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