I'd never do a century or longer without my aerobars. Way too comfortable to pass up. I kept my saddle in the exact same position as always so that my hoods/drops are still perfect. I've not noticed much saddle related discomfort on the aerobars, so I got lucky there.
As for the comment about "sucking wheel" for 160mi...no thanks! Much bigger accomplishment to actually ride the 160mi yourself. Might as well get an electric bicycle if you dont want to put in the effort.