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Are there any security concerns with the data passing through the OpenDNS servers?
For example passwords being extracted?
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What assurances do you have of your existing DNS server (none), do you even know who operates it (you probably don't know).
So when you answer both those responses then ask yourself the same about an Organisation that you do know who are committed to protection from malware and if you set it up parental controls, etc. There really is no contest.
Recently there was a DNS server issue where many were being exploited by malware, and there are still many that are vulnerable to exploit, but guess what OpenDNS never was they have been ahead of the curve in that regard.
That is my last on the issue, you can lead a horse to water but they have to want to drink, your choice.
