I heard the new Model 70s are the best ones Winchester's made, so I was thinking about getting a Super Grade in .270. Is there any reason for me not to get one?

They certainly are.

Even that MOA trigger isn't as bad as I expected it to be.

I only have one Model 70 and it is a transition '68 model in 7mm Rem Mag.  I like it a lot.  I've had the barreled action restocked in some gorgeous wood.

I looked at the new ones and do like what they are doing from a production and aesthetics stand point.  There was a review of one several years ago made in the FN plant in South Carolina.  What I remember and what caused me to not buy was the mediocre accuracy.  It was chambered in .308 and they could not get it to break 2 MOA with a variety of different ammo, including match grade stuff.  That was disappointing to me.  I realize it was a sample of one, and barrels do have variations in accuracy.   My own sample of one made back in the late '60s will shoot right at 1 MOA with boring consistency with decent ammo.  It is a hunting rifle and I don't need greater accuracy.  but 2 MOA -- more like 2.5 MOA with most ammo was not my idea of "the rifleman's rifle."