A great phone but...
I have the pleasure (and that's not sarcastically) of owning one of these phones after being gifted an invite - screw buying an invite on eBay! I don't like the fact that it will not work on 4G with O2 but seeming that with 3G I am getting ~7Mbps down ~1.5Mbps up this is fine for my day to day use. I rarely tether and when I do only need web and emails otherwise this would irritate me.
The charger really could have done with more thought as Gareth79 highlighted - it's shocking (pun?). The other thing is that due to the battery capacity to have it charge at a decent rate the charging cable is of a high quality but short. You try and use most other MicroUSB cables and it takes an age to charge, all to do with the gauge of the USB cable (https://forums.oneplus.net/threads/oneplus-one-charging-cable-alternative.68517/). So am trying, in vain so far, to find a decent cable so I can have one at work, home, car etc...
A great phone, version 2 will be better. Here's hoping that they sort out the issues (4G too) and do a better job of releasing the phone to the general public!
Good luck!