Just got this and overall I really like it. I don't seem to have the hip issue, at least not yet, and the articulation is pretty solid for a seamless suit. I also have the Mafex and in spite of the Mezco not being as accurate, I do like the seamless look, paint and the fact that it doesn't fall apart while posing. It does have it's issues though. My pros and cons:
Pros:
The silicone or whatever it is seems pretty durable. It feels like the stuff on that Hyper real Darth Vader and I haven't had any issues with that.
The dome on mine does have nice dark fogging on the front and back.
It feels nice and heavy due to the metal skeleton.
The eggs, especially the open one has great detail and paint with a glossy interior.
The different tongues are a nice touch.
Cons:
The tongues are not the right color.
The Chest buster and crawling face huger are from Aliens along with the base font.