1. I have it for about 3 months, love it but battery usage and storage I chose (16g) bother me a little, as iOS has no a detailed and accurate cache/temp cleaner system that causes me to restore iPhone to get rid out of them.
2. I love it as long as works great, and you know, apple has a strategy to make it's older products useless so their owners will have to buy newest product!
Remember how app store apps leave older iOS versions or just get too slow and unstable in their newest updates, maybe you don't believe, but that was only reason forced me to switch from my 3GS to 6S!
3. I always prefer white/silver colors, although it's depends on it's style.