G751JT owner here, I... I can't recommend this laptop. At first I was really stunned how good this laptop is. But after some time:
1.Due to some software (something stupid in bios) or more likely hardware bug, left usbs works only as usb 2.0, if you put anything with usb 3.0 in it, it will immediatelly stop from working.
2. If you wanna be sure that you will have m.2 slot, go with the ssd version. Otherwise, it will be like opening Kinder Surprise.
3. Though the ips display is top notch quality, it will likely develop bleeding on the edges in no time.
4. Software is really crappy. Like Asus doesn't even know what gamers want. I don't need to know how's weather (+ you can't change the location, mine is showing weather for the city that is like 400km away). I want to change my steam button to not start in Big Picture and change my backlight timeout without using registry or hex editor. And if you have Game First III installed on this laptop, you should immediately uninstall it, or you will have problems with internet.
5.These G751 laptops should support G-Sync without any problem, but Greedia and Asus wants more money, so they decided that you will not have it. The only limitation that there is, is some stupid drm made by them. I can understand that they are sold without advertised support for it, but it's just a bad move anyway.
6.Cpu and Gpu are soldered on the motherboard. You can't remove the battery without voiding your warranty.
7. One of the Usbs 3.0 ports on the right side can recharge your phone faster, but guess what? You can only be sure that this thing will work with iPhones, if you have some older non-apple phone there is a chance that you will not be able to use this slot for recharging at all.
8. Asus support, there are many horror stories on ROG Forum. But just to show you how good it is - I called them and 2 of their people didn't know that Asus makes laptops with nonsoldered ram memories under the keyboard.