I owned an Alienware 15 R3 for a while. It was the 60 Hz, i7, GTX 1070 version. Dell were horrendous, but the laptop was exceptionally good at what it was built for.
Quieter than my MBPr 15 inch under full load. Fairly good battery life, excellent screen. Really really good. Trackpad was okay, keyboard was great. Speakers excellent (for a laptop)
With regards to the fans, they're quite loud, but unobtrusive. They're a whooshing noise rather than high pitched whine