98% of my riding is solo, and I don't mind one bit. I never get bored -I use my time in the saddle to think and decompress. If I'm really pushing the pace the only thing on my mind is riding -cadence, technique, body position, focusing on the road in front of me etc...I guess for me I've almost always ridden solo that I'm conditioned for it. I don't mind a group ride, as often times it helps me push the pace and improve my bike handling skills.