If you're one of those people who gets easily bored with your laptop and need to tinker with your tech, read on! This is the story of my second-borne gaming laptop, the one that thrived. Don't worry, unlike my lengthy review of his beastly older sister, Lenovo Legion Y740, I'll cut to the chase...Ergonomics- Everythng about the chassis feels intentionally designed, from the off-center per key Steel Series RGB keyboard and trackpad to the narrow yet sturdy hinges, to the tiny top bezel cam...it just feels right. You can really see that the engineers at MSI were given a LOT of latitude to design the thinnest chassis possible at the lowest possible weight, including the slim Chicony power adaptor. The keyboard travel is decently tactile, almost as good as my Corsair K70 mechanical for positive actuation and somewhat easier to program SteelSeries software than iCue. Mostl importantly is the generous left CTRL key and the ability to remap Windows, ALT and FN buttons, esp. if righthanded. The hidden trackpad buttons are a little fussy and are the weakest part of the productivity experience.Performance and Thermals- You cannot talk about this laptop without addressing both of these core aspects together. I'll just come out and say it: He runs really HOT out of the box, like high 80's C without tuning. But give him the tools, like(see pictures)MSI Afterburner (with a revised flat curve)MSI Silent Option (replaces the Dragon Center and stop the dedicated GPU blower fan from"breathing")TechPowerUP ThrottleStop (-182.6 mV undervolt at 3.4 GHz)CPUID HW Monitor (for accurate measurement of thermals)Tech Powerup GPU-Z (to spot thermal throttling)Riva Statistics Server (it loads as part of GPU, so you can view in game thermals)and you've got a perfectly tamed beast taht will reward you with mid-70's gaming and mid-50's idle. The discrete GPU Nvidia's midrange 1070 Max-q is a solid 60-120 FPS performer with 8GB of RAM, but you will get little benefit from the integrated graphics in either the thermal or power aspect. The Lenovo has a MUX switch design in the BIOS which let you choose the discrete chipset over hybrid and that would have been a choice that I would have been willing to pay a little extra for, as the two chipsets must share the screen buffer memory and circuitry in order to use the common HDMI 2.0a port and panel circuitry. I took off one point for the fact that the discrete and integrated graphics will sometimes compete for resources causing a high FPS stutter, but a reboot usually takes care of that stuttering. The Thunderbolt 3 USB C port delivers 144FPS graphics too, but again it's a discrete GPU affair running graphics through that high-speed port as well.Sound and Noise - The built-in sound system is a little thin, and the Nahimic circuitry won't improve it much, but it is loud and not strident nor distorted. The three fans can get kinda loud when running above 70 C, but they will drop off quickly once the load is off., esp. with CPU-demanding game titles like Civ. At idle, it's cool and quiet.Screen - As a fast IPS like panel, it's just fine, not mind-blowing like the 500 nit on my Lenovo, but you won't really find much to complain about, unless you need a reallly bright display.Ports and internals - Here is where the Lenovo shines and her younger brother, the GS65 is weakest. Everything important seems to need the right side of the chassis, like power and HDMI/Mini DP, and USB C ports, The left side feels like an afterthought of USB 3.0 and full RJ45 GigE though separate mic and headphone jacks are welcome. Internally, it's a flipped MB (CPU, memory and M.2 slots are facing up, under the keyboard) and tricky to get quick access to.. Most importantly, the thin aluminum bottom cover of the chassis is very prone to flex, and you will need laptop pry tools to make any upgrades. When you do, however, it will give you a cahnce to blow out the three fans with canned air and repaste, if you desire, which made a BIG difference in the thermals and fan noise.Summary - Between the travel weight, performance and tuneability, this laptop fights like a champ! At two years old, look for it at under $900USD..