I can't say anything good about Alienware laptops.
My brother and I both have M17x from a few years ago, and a bunch of my students bought Alienware laptops (different models etc) after seeing mine. Against my warning.
Long story short, every single one of us have had problems (of varying degrees) with our laptops.
Dell DOES respond decently when you put in a claim on an issue, but the fact that 5/5 Alienware laptops all have had problems scares me.
I tell all my students not to buy them because it is overpriced, big and heavy, and has tons of problems. There is literally no reason to pick Alienware over another gaming laptop with similar specs.
EDIT: might as well share some of the issues: