symantec endpoint alternatives

Hi,  I just wanted to find out if anyone out there left Symantec Endpoint for some alternative and came back?  I have Symantec Endpoint 11 and have all kinds of problems coming up here and there for the past couple of years.  I was thinking to try Endpoint 12 but I still see posts about all the problems people are having.  I'm wondering if it might be time to move on and look for other alternatives out there.  Anyone has suggestions?  I manage about 100 clients and about a dozen servers.

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Thanks!