Product review (5 stars): Beats Re-installing the Under-sink Splash Guard
I've had mine for several months now.  What can you say about a simple product like this?  Buy it if your old In-Sink-Erator splash guard has become brittle/broken and is letting the water splash back when you turn on the disposal.  This simple solution is cheap and it works! No need to pull out the garbage disposal or even go under the sink to install the new splash guard.  Working from above the sink, just push the new splash guard into the neck of the disposal. It'll fit snugly, conceal the old splash guard, and work better than the old one ever did.  And, even though it's installed externally, it won't become accidentally dislodged.  It's also easy to pull out for cleaning.