I put a metric century on my B-17, first ride. No problems at all. 18 months later, it's fully broken in.

In the interim, I've ridden a 300km day, a 220 km day tour and several other 200km brevets. No issues, besides the usual aches and pains of long days in the saddle. Most importantly, no sores or chafing.

I also have a Pro I've been riding for 32 years.