I've used Neverfail for BES and SQL for serveral years now and have been very happy with the product. Aside from the failover it allowed me to patch my servers with near zero BES downtime.
I haven't test BES 5 failover yet so I'm no opinion of the comparison. I do see the following argument from Neverfail why their product would be better.
"Neverfail is a 3rd party component and can monitor BES processes. With BES 5 you are depending on it to monitor itself."
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Exchange 2007/BES 5.0.2 MR2
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