I like my S3X it gives me,with a 48x15 gearing with a middle gear of about 66 inches.I spend 80% of my time in this gear.Top gear is about 88 inches useful for swooping down hills and a low gear I have for seated climbs.Trouble is it keeps slipping in this gear,which is annoying to say the least.Oh and of course the old 24 inch gear.In my opinion the S3X is a great idea,but with a teething problem.