Yeah i am used to AMD now, plus im locked into AMD with my setup now. 849$ is really too much for my tastes. That said i bought my 290's on launch day and liked them even with driver issues. I don't think people will have any issues with one of these 390x which is what most likely will be the most used scenarios. I don't expect it to be perfect out the gate, it's just the way the PC market is nowadays.
If they do cost 850$ then i may hold off unless they are just too irresistible on performance. Really my biggest factors are going to be price, and extreme resolution performance 4k+. So i also wonder what the secondary top card will be like price/perf wise.