I have an iX500 as well. They seem to last a long time. Not sure if Ricoh is keeping the quality up or if there is a sub when this thing fails.
A quick Google suggests it might… 
I am using mine with no problem. However, I have it connected wirelessly and saving to Dropbox directly. So that may be why it continues to work with the latest scansnap software on the latest versions of MacOS.
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