I guess it depends on how loud your CA talks and how quiet the MD-11 cockpit is. We're required to make a "1000' to go" and "xxx climbing/descending xxx" challenge and response to the altitude alerter and a lot of times instead of opening the intercom, we'll just say it loud. Not shouting, mind you, just maybe how you'd talk at a crowded sports event or bar.
If I want to hear 'normal' conversation, I usually have to uncup the ear closest to the source, which to me is a PITA since I got the darned headsets to enjoy the blissful peace and quiet! This happens mainly when we have a jumpseater who doesn't wear the extra headset. If MD did a good job insulating and your wind noise isn't that bad, then you may have better luck. I just know I wouldn't enjoy an un-miked conversation under my particular circumstances.
They are quite comfortable; however, the longest I've worn them is just under 4 hours.
Where they really come in handy is when you listen to whatever floats your boat on the ADF (probably not too terribly available in your case), they dampen the background noise enough to where I can easily pick up ATC xmissions over the din of my "right-wing radio!"
I've seen a few people fly with ipods and the like, and I imagine they help in those circumstances as well. I know an ACA CA that makes and sells a balanced cord that plugs into the ACM jack so both parties can enjoy the 'inflight entertainment.'
There's always the 30-day money-back guarantee!!
Hope this helped!
ps What's it like flying the MegaDog out of ANC? Will there be growth there? Is that a junior position? Is it day or night flying....more night this time of year I imagine at that lattitude. I wouldn't mind living in ANC; plenty of hovercrafting opportunities!