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Pros
Pro Provides a useful series of tutorials
Zopim has a youtube channel that provides tutorials on using the product, and customer service tips.
Cons
Con Not a complete user support service
Zopim does not have all the features you may expect from a User support software. It is owned by Zendesk, so it's recommended you combine the ticketing features of Zendesk with the live chat on Zopim.