One + One, is a good phone with good value for money, and like the Nexus 5 One plus isn't making money from it, now that's said, I doubt the experience is as refined as on lets say an HTC One, the built quality and feel isn't to begin with.
But anyways if the software is good enough, this phone could be a great alternative for those with a limited budget, the only thing is that you need to be invited to be able to buy one, which anyways mean that supplies are so damn low
At the moment you need to be invited to get your hands on one, but not long after that you will be able to buy it from the stores in your country.
It runs Android v 4.4.2 with custom cyanogenmod 11s
There is a quick look video on youtube where a famous tech reviewer compare the OnePlus one with the Galaxy S5 and Oppo smartphone.
Search for oneplus one in youtube, and you will see the video from Android Authority popping up.