I was finally able to get a copy in my hand yesterday. The pieces are great, except the scale is off. FFG has said repeatedly how true to scale they were trying to be, yet the Tie is too big. From all the measurements we've seen over the last few months (and from what I've been able to find in my rather extensive library), a Tieln should be 6.3 meters long, and an X-Wing is 12.5 meters. In 1/270th scale, that comes to 2.3 cm for the Tie and 4.6 for the X-Wing. The X-Wing is almost spot on at 4.5, but the Tie is a full centimeter longer at 3.3cm.
My online order hasn't arrived yet, so i can't take a good look at the Y-Wing or Tie/Advanced yet.
I guess it's possible that they are to scale with the original production models used by LFL (and not the canon measurements), but I haven't been able to find a picture with the models side by side.