Not always but, I regret buying it "whenever",
I watch a dark content video.
I have to press power button really hard without any feedback.
I get a phone call and I don't want to answer it but I have to wait until it ends.
I try to increase bass in Audio Wizard but all I get is weird sound.
I have to charge battery more often than my other 5000mAh phones.
I go to About section and see the level of security patch.
Finally the feel of having a device which has worst service centers incase anything goes wrong.
There are the moments I regret buying ROG 2.
Other than during these moments. I kind of like it. Especially while gaming. My device is performing exceptionally.