My experience suggests that if there's any discomfort at the end of a 30mi ride, then there will be a lot of discomfort at the end of a metric century and anything beyond that will be excruciatingly painful. Keep in mind that I'm talking about "regular" saddles here, not a Brooks. These types of saddles are not going to mold themselves to your anatomy, nor is your anatomy going to adjust to the saddle. Brooks saddles may be great and last forever, but I'm simply not willing to deal with the extended break-in period; I want a saddle that works well right out of the box...