I have not experienced any flickering at all. My current monitor is a Samsung Syncmaster P2770.
My old rig was going on 5 years and was planning a new build anyway. The question was staying with AMD or switch to Intel (last Intel was well over 10 years ago) and nVidia; no loyalty to either, and AMD had been a good bang for the buck, but this time the 4770k seemed like a good choice for BF4 and got it for $279, so figured what the hey. I almost pulled the trigger on a 780, but decided to try out the 280x first. There was no 290x non-reference card out yet and generally ~$300 is about my limit on video cards. The way people were talking, BF4 looked to require a very high end GPU. That is certainly not the case in reality.
I can't compare to an AMD 8350 (for example), but the combination in this new setup exceeds well beyond what I expected. 75+ FPS average with 50 minimum in Ultra/HBAO was not even on the radar. Nothing is overclocked. There is no lag at all on any map, even in Operation Locker with mobs of players packed in a small area with nades going off etc. I really put it to the test.
The 280x, IMO at this point, is the sweet spot for BF4, but is subject to change. I don't trust "benchmarks" much, only real world in-game tests with full servers.
Dice/EA will fix the issues, people will just have to be patient. I like BF4 better than BF3 as it is has the commander and VOIP like BF2, and the nade spamming is greatly reduced, which to me is a definite plus. Sadly, sniper overpopulation is becoming commonplace, oh well.