Yes, they are quite fine for a century. Before getting some $200 dollar bibs a few weeks ago (gore xenon) I used the hammer bibs for numerous 100+ mile rides. I rode 213 miles once with them.

I think they are great bibs for the price and own 5 pairs for my daily commuting and training rides.

However, the xenon bibs are leagues ahead in every way. They fit like a second skin.