trying to break in a new saddle on a long ride can be disastrous -- I've done it not once, but twice, and will not do it again. My worst experience was a long ride I did alone, a long ways from home, with my transport driver out on a separate ride. 10 miles out I started having problems, which only got worse over the next 50+ miles. I managed to complete the ride & limp back to the car, but I was in sorry shape for days afterwards. Now I will only break in saddles close to home where I can abandon & get back easily if the saddle is a complete bust. If things go ok, then I start cautiously adding time + mileage. I would stick to the devil I know until I'm really sure about a new one.