Our testers found that differentiating features you'll typically see at the store may not deliver the durability they imply. We also found that some models with fewer features and a shorter warranty cost more than relatively similar competitors. Home garbage disposers typically last about 10 to 12 years, according to InSinkErator, though not all reach the decade mark. A longer warranty does not guarantee longer life and can also make some models cost more than otherwise-similar machines. Here are the garbage disposer features to consider:
We won’t sugar-coat it. This one is the doozy. If the leak is located at the bottom of the unit that means at least one internal seal has slipped, chipped, or flat-out deteriorated. The catch is, there are lots of these seals inside the disposal, and if one has failed it means the others are on their way. You can replace these seals with expensive, original equipment manufacturer (OEM) parts – or you can just get a new garbage disposal.
Disposers range between $45 and $250, and most hold up fairly well under normal use. It's common for a $50, 1/3-hp disposer with a 1-year warranty to last 10 to 12 years. So what does more money buy? Increased longevity, longer warranties, more power and less aggravation. The better units have stainless steel components, auto-reversing starts and bigger motors. Units that reverse direction with each start greatly reduce stoppages, while larger motors can chew through larger and more varied food loads.
The horror movie image of victims having hands and arms severed in a garbage disposal is entirely a Hollywood invention. In reality, the blades inside a garbage disposal are rather dull grinders, not gleaming, razor-sharp sabers. That is not to say that a disposal should be taken lightly—it is indeed possible to be painfully injured if you don't practice basic safety measures. 
If your garbage disposal is making a clicking or rattling sound, there may be some food particles that will not grind up inside. Remove power from disposer, reach into the sink hole with a pair of tongs and remove anything that is still down in the disposer. Test your disposer to be sure the noise is gone. If not continue troubleshooting your disposer issue (see below).

Garbage Disposal Replacement