Interesting that you have it on, I've always read to switch it off as it slows af etc. Have you tried shooting with it off?
Initially I shot with it off all the time, but I began to experiment with it and was quite surprised by the results: Generally if I'm above ~1/100th I'll turn it off...
Disclaimer: I can't talk about the Sport, I have the DG OS non-Sport that preceded it. The reviews say the Sport is supposedly sharper and has better AF.
Durability: I've owned it for just over a year and its taken some SERIOUS knocks in that time and still works perfectly!
AF: Superb. Mounted...
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