Yeah, I've only heard of issues with the Aliens variant, unless others can advise otherwise. I'd buy one of the others, but I'm afraid I only really like the designs from the first two films.
I'm still hopeful they'll nail the Giger original. I'm also wondering how the rubber on my Medicom Alien will be in a year's time. That said, it's not really the rubber that's the problem, it's the paint - and there's none on the Medi! Perhaps that's why it has such simple paint apps?