Bought series 7 today, got to look through about 5 cases. The AvP Aliens look nice and are pretty cool.
As far as the Concept Alien goes, 2 things I noticed:
1. There are variants
2. Some QC issues.
As far as the variants go, they are packed 4 to a case, 2 have the regular lowered upper lip head, and 2 have the raised upper lip head. Aside from that, it looks like there is a paint variance as well. I don't know if it is intentional, but some are very much covered/coated in the off-white paint with only a bit of the translucent plastic peeking through at spots, and others have a much lighter paint application showing a lot more bare translucent plastic.
As far as QC issues, I saw a lot of reversed limbs (mostly 2 right upper arms or 2 right lower forearms or something like that) major plastic chipping/deformation, very gloppy and sloppy detail-obscuring paint, a lot of flash around the edges of the bottom of the torso and limb joints and a lot of limbs and the jaw kinda popped halfway off in the package. Not all were like that, but quite a few were. Glad I didn't order online.