Nikon - A little venting.

Today my 2nd replacement refurb d800 (3rd in hand) is to be delivered. The previous two had the left AF issue and were returned. The d600 I had was also returned for spots. My previous d7000 Also had focus issues.

I'm getting very frustrated with Nikon and now I'm reading of people reporting that Nikon is using "impact damage" as an excuse not to warranty cameras/lenses.

I'm starting to feel like i should either pick up a good used D700 our maybe even switch to canon and pick up a 5D3

How's the ISO performance of the d700 compared to the d800?

Anyone else this frustrated?