Nice write-up Vern and have to say I agree with most of what you have found. Mine was also an ex demo with less than 60 miles on the clock and unmarked.
Sound - hence why I got the Stillen even before I could collect the car - the OEM zorst is the biggest let-down on the 370, unlike the 350 (UK version) which is a lot better.
Fangs dealt with as per my sig below. They are certainly more noticable with the bright colours, but as you say the 370 does seem to attract more attention - compared to the Ebisu and Blade 350 before. I feel that the more aggressive frontal appearance with the wrapping does seem to get more slower drivers to move over than I found with the 350's
Having come from 276 then a 296 engined ZEDs, there is more power - but really it is not much and as I have found on 350z-uk drives the (standard) 350's hang on well - mainly because the visibility is better than the 370 as you sit that much lower and picking the apexes is little more challenging and on tighter roads the overall width seems much greater with the few extra millimetres over the 350. The mid-range torque on A & B roads is much better than with my previous 350's - a definite punch in the back when giving it some beans
My biggest bugbear is the tramlining and steering feel - mainly at low speeds. But I plan to get Abbey to get that checked/changed and if necessary change the 'Stones'. We all know the 370 'scrubs' when on full lock and especially when the tyres are cold but I am beginning to feel there must be an improvement in the tyre department as it just hasn't got that spot-on feel that makes the 350 such a driving pleasure. So for me the jury is out on the 050A's.
The cabin has a much nicer overall feel although I do miss the storage areas of the 350. And the seats are not the same - the side bolsters certainly make it more of a snug fit for my 38" hips - to the point where I 'shuffle' more on long runs but it is not uncomfortable and a little more use will, I am sure, make it the perfect fit .
But hey, for me the biggest + is the syncro-rev, which combined with the Stillen makes it feel something very special
Like the 350, I feel it is great value for the money (and was just within my budget, unlike similar aged alternatives it is often compared with) and as I am fortunate in not having to use it as an everyday car it is not breaking the bank - so it is for me