Recs.
Updated
OnePlus shook up the market with the One, and has followed it up with the 2. Providing high end specs at half the price of it's competitors seems to be OnePlus's call to fame, and it does it pretty darn well.
Specs
Pros
Pro Good performance
While not stunning, the performance offered by the Snapdragon 810 will be plenty for most users. It runs a little warm, but the phone will throttle a little bit to prevent it from getting hot. Throttling will reduce performance a bit, but it will still feel quick except for demanding games until it cools down enough to get back into full performance.
Pro Good display
The 1080p IPS display is worse on paper than other high-end phones, but in the real world it looks good. Dark colors get dark - although not as dark as Amoled displays. Outdoor visibility is really good, and colors are life-like without looking too oversaturated. The auto-brightness sometimes is a bit too bright indoors, but that's not a deal-breaker
Pro Solid camera
The OnePlus 2's camera offers solid specs such as 1.3 micron pixles (larger than average pixels, letting in more light), laser auto focus, as well as OIS. The 13MP camera isn't the fastest - especially when taking HDR shots - but it captures a lot of detail and doesn't suffer in low light shots (especially if you use the maximum 30 second shutter time).
Cons
Con Missing some high end features
Which nobody ever uses and makes the price lower.