I ride my primary bike all the time and only use my backup if I need to or if a friend wants to ride with me (a friend who doesn't have a bike). I've considered rotating between the two but there are two reasons not to:- [1] the backup has front suspension and is therefore heavier to carry in and out of the house, [2] if I rode them both I would have trouble remembering to maintain both, but with one I can mentally keep on top of it.