I haven't done a lot of it, but I like to restore. For me, there is a satisfying feeling in bringing a bike back to life in as close to its original form as possible. I don't think I would qualify as a purist because I am always open to carefully upgrading some components if the upgrade really makes a difference in the performance (or safety) of the bike, especially with seats, brakes, and cables. I like to "rescue" bikes, I guess.