I've flown Northwest DC-10's quite a few times. Consider yourself lucky to be flying one and enjoy it while you can. I traveled through MSP
on Sunday and was looking at all the DC-10's thinking about this. It will be a sad day when the last one is replaced by the 330 and it departs (most likely) for the scrap yard.
As far as the comfort and experience of them. I don't know if you have ever traveled on one, but I've found little difference in them between the airlines other than the color of the seats. I remember traveling on a UAL 777 and connecting to a UAL DC-10. It seemed like I had double the legroom on the 10.
Enjoy your trip