Trust me alienware quality is not really that great, see if you can explore Lenovo legion pro series assuming you are looking out for a laptop.
PS. i have 2 Alienware m15r2 and 4 Legion. and never i had to get any of the legion repaired. alienware i cant even count.
there is a list of parts i have had to get replacement in the span of last 4 years
motherboard - 3 times
display - 4/5 times
battery -6/7 times
trackpad - 1
keyboard - 1
network daughterboard - 1
heatsink with fan - 2
complete housing - 1
Im not trying to scare you, they may have increased the quality since then.