Apple says the 5s will offer approximately double the speed and a slight improvement on most tasks. Looking at the speed from a 4s to a 5 I can feel comfortable in getting a similar increase in speed from a 5 to a 5s... If I open up an app, game or access a setting 150 times a day (which might be a low number) and I save on average 2 seconds per instance it would save me 300 seconds or 5 minutes a day of wait time. Over a year that would save 30.42 hours which to me is worth the investment of $100 versus the 5c... Regardless of when my upgrade is due. My time is valuable. What are your thoughts?