I was using 4s before then I moved to Android but recently purchased iphone again. Its been a week, I am using this iphone6(16GB).Here are my honest feedback:
Display - Amazing and clear. nice visibility in outdoors too.
Design and build qulity - No doubt. you wont disappoint with apple. Phone is super sexy!
Battery - Being a moderate user it lasts a complete day with 25-35% battery left. So no problem at all.
Software - It comes with ios 10 preloaded.super smooth.multi-tasking is a fun. It comes with 1GB Ram and seriously there is no lag at all. You can easily compare the device with high end RAM ones for the speed. Still iphone will perform better.
5 Camera - Top class during daylight. Even at low light image is acceptable.
Music - Loudspeaker is great this time.even on the earphone music qulaity is nice. It may take few hours/days for you to get familiar with itunes. Its great once you are familiar with it.
Gaming - I am not a hardcore gamer. I have installed 2-3 games and did not find any lag at all.
8 About 16GB space - I have installed 8-10 apps including games, whatsapp, paytm etc and have around 325 mp3 songs and 10-15 Images so far. I still have around 7 GB left so far. I think thats too much for future camera clicks and adding up more songs to the libraray.
Hope this review works for all who are looking to buy ths phone.I will definitely recommend this phone to all!