I'm just disappointed that there is no slip, but it was to me a gamble worth taking as you still get all the extras you don't get from all the other editions. And more importantly, it is a steelbook, not a Metalpak like Korea's!
As for gloss vs matte, I'm one who is very happy with matte finish with some metallic shine to it. It has the true look and feel of steel. And a much more lasting look than gloss. Gloss finish on a steel looks the same as any gloss print on a card. The underlying steel hardly matters.
Worse still, gloss finish is so easily scratched just running your fingers over its surface. When I got my first gloss steelbook, MI Ghost Protocol, it was instantly ruined by fine scratches the moment I ran my fingers over its surface. In contrast, you could keep running your fingers over matte finish steel and not end up with a scratch. And it really feels so smooth and nice to touch.