I went from the 5S to the 6+ when they came out last year. The screen is amazing, it really is great having access to a huge display all of the time. The battery life is outstanding as you'd expect, mine regularly goes two days without charging under normal use. Reachability is kind of lame and doesn't work half the time, the exclusive 6+ features are pretty much ******** - don't let them factor into your decision. The extra money you pay over the standard 6/6S is for the screen and battery, nothing else. My main issue is usability, I have huge hands and still can't reach the top corner of the screen. Wouldn't bother me so much if reachability was reliable or if it dragged notifications down with the screen, which it currently doesn't. When you're using the device with two hands or lying on the couch etc it is outstanding.
Use it one handed or when you're out and about and it becomes a pain. It is very noticeable in your pocket - IS THAT AN APPLE IPHONE SIX PLUS IN YOUR POCKET OR ARE YOU JUST GLAD TO SEE ME HA HA HA - and can be uncomfortable when you're sitting in a car or something but I can overlook that. The real issue is one handed use, you never realise how much you do this - on the toilet, replying to a message while walking through town, masturbating, cooking etc - it's made a very unpleasant experience due to the top-heavy weight balance more than anything. So is using it for calls, unless you're the BFG you look and feel pretty stupid. Like I said I have huge hands and still find it uncomfortable to use one handed. The Apple Watch makes this a little less irritating as you can perform your quick interactions from there but even then I still get annoyed with the phone size. I'd also say that the iPhone 6 (and even the 5S) have better performance, there are a few quirks and issues using the 6+ that are not on the smaller models.
Overall I'd say it depends on your lifestyle - it is not an iPad replacement. If you have an Apple Watch, massive mutated hands, rarely make actual calls, or just chuck your phone in your bag then the larger size will be less irritating, if you have anything other than late 90's baggy jeans it can feel a little unpleasant in the pocket. If you're a 'normal' sized person I'd be prepared to get annoyed by it. But when you're sat comfortably with both hands available it is the best iPhone by far. However the smaller model has better performance, is cheaper and is just a little more discreet and classy. It's close but I have decided that the negatives of the 6+ just slightly edge out the positives and will be selling mine for a standard 6S.
Use it one handed or when you're out and about and it becomes a pain. It is very noticeable in your pocket - IS THAT AN APPLE IPHONE SIX PLUS IN YOUR POCKET OR ARE YOU JUST GLAD TO SEE ME HA HA HA - and can be uncomfortable when you're sitting in a car or something but I can overlook that. The real issue is one handed use, you never realise how much you do this - on the toilet, replying to a message while walking through town, masturbating, cooking etc - it's made a very unpleasant experience due to the top-heavy weight balance more than anything. So is using it for calls, unless you're the BFG you look and feel pretty stupid. Like I said I have huge hands and still find it uncomfortable to use one handed. The Apple Watch makes this a little less irritating as you can perform your quick interactions from there but even then I still get annoyed with the phone size. I'd also say that the iPhone 6 (and even the 5S) have better performance, there are a few quirks and issues using the 6+ that are not on the smaller models.
Overall I'd say it depends on your lifestyle - it is not an iPad replacement. If you have an Apple Watch, massive mutated hands, rarely make actual calls, or just chuck your phone in your bag then the larger size will be less irritating, if you have anything other than late 90's baggy jeans it can feel a little unpleasant in the pocket. If you're a 'normal' sized person I'd be prepared to get annoyed by it. But when you're sat comfortably with both hands available it is the best iPhone by far. However the smaller model has better performance, is cheaper and is just a little more discreet and classy. It's close but I have decided that the negatives of the 6+ just slightly edge out the positives and will be selling mine for a standard 6S.