Is the ROG Strix G16 good for gaming?

Yes. The dedicated GPU, MUX switch and strong cooling deliver high frame rates on the WUXGA screen. It is built for sustained gaming rather than short bursts.

Can I upgrade the RAM and storage?

Yes. It has two SO-DIMM slots and two M.2 SSD slots, so you can add memory and a second drive yourself. Check the exact configuration before buying.

How is the battery life?

Short when gaming or running the GPU. Expect only a few hours of light use, so plan on keeping the charger nearby.

Does it have a MUX switch?

Yes, with Advanced Optimus. That lets the laptop route frames directly from the GPU to the screen for more performance, or switch to integrated graphics to save power.

Is the fan noise a problem?

Under heavy load the fans are clearly audible. In quiet mode it is calmer, but performance drops. Headphones help during long sessions.

How does it compare with the Legion 5 or Helios Neo 16?

It trades some portability and battery life for strong cooling and easy upgrades. The Legion 5 is quieter and lighter; the Helios Neo 16 is a close rival on performance.