You can find that on notebookcheck so I won't write more.

I will share my son picked up the ASUS ROG GL552VW-DH71 15-Inch Gaming Laptop, Discrete GPU GeForce GTX 960M 2GB VRAM, 16GB DDR4, 1TB (ROG Metallic) and I moved to the ASUS ROG GL552VW-DH74 15-Inch Gaming Laptop, Discrete GPU GeForce GTX 960M 4GB VRAM, 16GB DDR4, 1TB, 128GB SSD (ROG Metallic) 2 months later.

For his we swapped out the HDD for a 500GB SSD (these are 99 bucks here) and I swapped out the 128GB SSD for a 500GB.)

The only quibble I have is that I had to use my tech foo to update the video and network drivers. I will not be nice that makers today are still in the 1990's about that.