Yup. VQ engines have always been noted as being harsh top end. Not helping the matter is the VQ37VHR revs even higher and is more harsh. Saying that, its not normally noticed as a vibration, more the engine sounds harsh hence my comments about a new exhaust. Maybe you should take it for a quick once over at the dealers? Unfortunately I cant rev mine that high just yet, still under 1k miles. Colin (Ebized) or Mat should be able to confirm as they have more miles on theirs.
Can't say that I find the engine 'harsh' at high revs but then again, as Chris says, with the Stillen cat-back exhaust I had fitted with just 250 miles on the clock I have not heard it as standard. But going back to when I got to drove the fully run-in 370 examples at Silverstone with the standard exhaust systems, I can't say I was aware of undue harshness then - ah - just rembered had the crash helmet on
Having given mine some beans around Wales recently it is truly a step up from the 350 And it is nice to have some great torque in the mid range which makes overtaking when cruising effortless - even more so than with the 276 or 296 350's and they, as everyone on here who has a 350 knows, are no slouches in that department