Played quite a lot of XCOM 2 on the Aero 15X last night. Visually, it is spectacular. No regrets buying the HD screen; there is very little need for more pixels on a 15" screen and the high refresh rate, in conjunction with the graphics card and processor makes everything smooth as silk (I had one judder in a landing-party cut scene, but XCOM 2 does that on most machines, in my experience).
Of course, most of that is going to be true of any new-gen gaming laptop. The cooling system is what matters here. I tried running it on my lap for over 2 hours on both Normal and Gaming fan modes.
On Normal, the fans are obviously very audible, but not exceptionally loud. It's not going to disrupt other people in the room's enjoyment of the TV or anything like that. The laptop does run hot but it's less-than-comfortable but not unbearable. And the heat is mostly focused at the back of the kit. You're not going to burn your hands on the keyboard or trackpad after a while. One caveat: it does get warm (not really hot) either side of the trackpad, where the ball of your hands often rest.
Switching to Gaming, the fans went really quiet for a short period, which made me think I'd done something wrong. But, when they crank up, they are loud. I could hear it quite clearly a room away, with a washing machine running; this is definitely likely to irritate people around you. On the other hand, it does the job. The hand rests go from warm to cool; the back of the case goes from hot to warm. And, while loud, there's no whining noise underneath, like you get from some fans. It's more like having a Dyson Air fan than sitting in the cabin of a plane.
So I guess you pays your money and make your choice, which can only be a good thing. When I'm on my own, I'd rather run the machine cooler. If other people are around, particularly if I can put it on a table, I'd rather run it quieter. For me, those two settings are perfect; if you want to customise it more finely, there's an option to do that too.
Special shout-out for the speakers too. I intended to switch over to headphones after a while, but didn't see much point in the end. The sound is way better than your average laptop and the positioning somehow makes stereo effects work.
I continue to be impressed. You wouldn't believe it, reading my messages in this thread, but I'm generally easily irritated.