If you are not a developer, this laptop does not have any fancy features. It is not slim, nor it is very light. There is no USB C or Thunderbolt, the graphics card is not great for gaming either, though it works well for Photoshop. Overall it's a very dependable laptop meant to be a workstation, it just isn't as portable or flashy as many Ultrabooks.
The GTX 1070 GPU found in this laptop is perfectly capable of running even the most demanding games ate very high framerates. For example, it's capable of running Rise of the Tomb Raider at 88.7FPS on ultra and Doom at 122FPS on ultra.
The build quality for the Asus ROG GL502VS is almost flawless. The aluminium lid and the plastic body are both covered with a brushed metal finish. There are also no protruding edges or uneven gaps. The build quality is on par with the price you pay for this laptop.
To get to the internals for this laptop, you will only need to remove ten screws, this includes fans, motherboard, CPU and GPU. Although the last two are soldered.
The keyboard is nothing truly special. It's pretty reliable, with keys that have a concave shape and that are coated with a non-slip surface. The keys themselves have a travel distance of 1.5mm, which is actually very common for gaming laptop keyboards.
Overall, the ROG GL502VS has a pretty solid and reliable keyboard with little drawbacks if any.