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El Capitan is still ridden with Networking, WiFi bugs. AS well as sleep wake bonjour services working randomly if not at all. I'm hoping the next update fixes these issues, but I highly doubt it. These are problems going back all the way to Yosemite. Some all the way right after Snow Leopard. It's as if Apple doesn't really pay attention to fixing CORE functionality.
 
It's an older computer which I use for test purposes like this so instability is part of the fun. I have a number of other Macs which are more reserved for upgrades.

I agree with using older Mac for testing purposes.

However instability isn't fun in my opinion. Thats the reason I never install new OS to my work Mac until I have tested it fully on the test Mac.
 
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