'Don't leave home without it' IMO. I have mine set to "low" and it keeps the chain lube flexible and moving. Yes, it makes something of a mess, but I like cleaning my trusty 750, too, so I don't mind.
I think you'll find me in the minority, though, as this thread wears on!
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Maybe look for the Diamond Powersport chain, if available there. They have a closed-clip masterlink available for them that is the Devil's own to get on and off, but they NEVER let go or break.