i got my HAF XB today.
Its not portable, its heavy and quite big. It does look cool though.
The build quality is high, but not super high; thumbscrews are super hard, a cutout in the mobo tray is too small, some minor annoyances.
Looks really nice. 99% steel, but has front plastic bezel - however, (and i hate plastic), this is the best plastic bezel i have ever seen. Sturdy, doesnt come off unless you try really hard.
Layout is pretty sweet, but as i have learned, its not AIO friendly.
My Nepton wants to go on the top, to blow out the hot air, but there isn't enough clearance; instead it should go in the front .. but:
1) it changes the case from positive to negative pressure. (and we all know what that means .. DUST!)
2) it blows air from the front, which sux if you are looking at the case.
All in all, 'd give the case a solid 8/10, because its cheap and works fine for a cube case.