Downloaded it, had a small short test run. Like Stingerhs said, they 'improved' the look of the maps, no suprise really, looking back at the old half-life it would have been a very empty research station.
Certainly worth it to play it again; these guys did a stellar job on recreating this old classic.
Edit: Oh, there are some funny achievements to be unlocked at the start of the game. Involves microwaves and toilets