@R Daneel Olivaw -- "System Shock 2: 25th Anniversary Remaster" was released "26 Jun, 2025"

It has:
Full Controller Support
1. Xbox Controllers
2. PlayStation Controllers

Single-player
Online Co-op
LAN Co-op
Family Sharing

The LAN Co-op is a absolute blast (admittedly there was a nasty DC bug that AFAIK is now fixed).
The controller support plays great on Steam Deck and Linux PC on XBONE* Controller.

The price appears to be 12.99 -- I think I paid double that at launch and it was still worth it to me.

I get that if money is tight some people would prefer the old version on sale for 90% off, but in my opinion the new version is wayyyyyy better.

They had to rewrite a ton of the source code which was lost to time AFAIK.

The only thing they could do to make me happier is release the source code someday or submit it to the GOG Game Preservation program. I play at 5k resolution and everything looks great, game runs on Vulkan and there are much more settings like HUD, default Audio is correct for me, keybindings, intuitive Steam Deck menu improvements (for mouse & keeb designed game).

Honestly, if you liked the original I can't see why you wouldn't love the higher res textures & all the amazing improvements.