We got our first Claas in 98. That was an 840, It had a Mercedes V-8. The 820 had a V-6, i knew a guy who had 2 of them and said he sure fixed a lot of shhet metal, cracked from vibration. This guy fixed a lot of other stuff, too, so his experience might not apply.

I think the Claas is a good unit, I don't know a lot about the NH's. Go with whichever you find in the best condition and have good dealer support for.