Im a regular user of iphone since 5 yrs. the best model they made till now is the iphone 4s, regarding the battery and data usage on a sim card. they should bring the price an economy friendly for the users.
I recently buy I phone 6 it was good phones there is pros and cons.
PROS
Compact size
Camera
Ios 8 which is faster ever
Fingerprint scanner
Gaming performance
CONS
Battery was not great for heavy user.
Heats up a little bit with extensive gaming.
Screen resoulation.
Doesnt have optical image stablization.
Price little bit high for casual person.