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Had my LS 20XL's for three years and will never go back to DC's or anything that isn't ANR. DC's are clamps and hurt like hell when you are pulling a 6-8 hour flight. After 8 hours of flying the Lightspeeds have never bothered me. They key is to always have a pair of backup batteries in case they go out during the flight. When the ANR is working, you can't beat 'em.
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Hell yes, I have pulled 17 hour flights with military issued DC's on OMG I could have sworn my head was gonna be permanently dented in.
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Everybody's mileage varies.
My longest day was a four-leg trip in a Twin Comanche from Grand Rapids, Michigan to Houston, Texas, and back. 12.8 hours flying time total in one long-arse day. And my Clark's still felt good.
All depends on the person, which is why everyone recommends you test-fly a pair for a while before purchasing if you can.