I think I would have been less kind about this if it wasn't free.

The settings list Nvidia provided recently definitely helped make this run at a stable framerate (it looked around 30 for me on my 3080), but there were still some dips. There were some moments while playing that I thought looked neat lighting wise, but it's definitely more of a novelty than a groundbreaking change in the pc world as it stands currently. I can't say I had an experience that felt better than just replaying vanilla Portal.