I didn’t like OPPO F1, because its use Android Lollipop version 5.1 as factory default Android operating system, it will be better if use Android Marshmallow by default.
Its cost more Expensive, may be this is an other disadvantage of OPPO F1 will make some users think twice before buy this phone.
Even if we bought for expensive price, this phone does not have fingerprint sensor which usually include at high end smartphone.
Again it has a Weakness of OPPO F1 is not have NFC for data communications, alternatively we have to use Wifi or bluetooth for data transfer or other wireless communications.