This topic has been well covered before,my opinion is the same now as it has been in the past,only a goose would intentially run a locked diff as a daily driver.
Heres another example: Early last month we had the KB10 entered to compete at an event 320klm's from home,as i only have one trailer we where forced to drive the thou to the event as the other car is not registered,the KB10 has a locked diff and we felt it would ok if driven quietly.To our horror just before our destination we discovered we had broken an axle on the highway moving along at highway speeds constantly going round big sweeping corners.All of Saturday was spent finding axles and once removed the diff was also stuffed(cracked side bearing carrier)after much expense and work in the pits we had it back together to run on Sunday with a borrowed open diff.
The car ended up running 2nd in class,had we found another trailer and towed it(with it's locked diff)i am quite sure we would have won our class.
I'm sorry for the editorial,but we can all learn from others mistakes,even oldies like me.I SHOULD HAVE KNOWN BETTER!
Cheers Bert