I agree that they have a track record of not following their schedule.
As GPUs currently take more than 6 months to ROI (barring free power) I would still avoid choosing GPUs based on their ability to mine Ethash.
I think this is too long to get a profit and now I can say it is not too profitable anymore because seeing the condition of ethereum prices which are currently very cheap will not be able to provide maximum profits anymore. now the miners have started to decrease due to seeing the collapsed condhere price of ethereum.
Why are you trying time after time count in ETH? If you want to mine it - buy AMD, RX57(8)0 are the best choice and be happy. Tractor can move on the road but you`d prefer a car i think.