I ordered the phone on the launch day (Dec 2) as soon as I got the invite (yeah i was that desperate!). It has been 7 days since I started using the OnePlus One.
Pros
Great design (feels great to hold and operate)
Screen is awesome
Great battery life
Call quality
Loud sound
Stable OS
Decent Camera
Slow motion video
Cons
Heats up during some games. This seems like a software issue rather than hardware. Reason being some games like Asphalt runs fine, but a game like Deer Hunter causes heat up. Asphalt is a much more demanding game. So it seems to me the OS is not optimized (governor?) to run all games.
Other that this, I cant sync FB photos to the existing contacts (something to do with Cyanogen).
I do not gets notification on the icon. For e.g. if there is a new whatsapp message, I get a notification in the status bar. However, there is no notification on the whatsapp icon itself. I had this on the i9505, and miss it on the OPO. Also, the touchscreen responsiveness of One can't match the S4 (S4 is butter smooth).
Overall I love the OnePlus One.
The battery life is so awesome, that when i came home from office i had 80% charge left. I had 3G on all the time at office and do casual stuff like email, whatsapp and FB. I keep the brightness setting at just above low all the time.
The yellow tint issue does not bother me. I did not even notice it before all the threads started on OP forums.
And I am very happy OnePlus choose Amazon - shopping with amazon is always such a pleasant experience.