I just want to point out, for all the readers of this forum who may be basing decisions on things you read here - this is an over dramatized opinion of the iPhone 6+'s performance.
While sunking is of course entitled to his opinions, and his gripes with his device are valid, the idea that the 6+ is worse than the 5 is absolutely a joke generally speaking.
Personally, I use TouchID and Apple Pay everyday so there are two big features that are missing in the 5. The 6+ camera is better, the display is larger and developers have enhanced their apps to take advantage (still a work in progress, but many of the bigger devs have done so in both portrait and landscape). Battery life is great, the display quality is great and it has everything that makes an iPhone awesome (great services, iMessage, FaceTime, AirDrop, PhotoStreams etc).
It's not perfect, more RAM is always welcome though I don't have nearly the trouble with reloading tabs Sunking seems to have. I look forward to the 6S+ improving on this design and iOS 9 stabilizing the OS (which has become pretty stable in mind on 8.1.3.
All-in-all, if you are an iOS/Apple fan and/or have liked iPhones in the past, the 6+ is undoubtedly an upgrade from the 5. Like any device there are pros and cons that must be weighed against each individual's own value proposition and use case.
Do your homework and get whatever device fits your needs. The 6+ fits mine perfectly. Best smartphone I've owned. And I look forward to the 6S+ (which I will definitely get being on the AT&T Next 12 plan).