When I saw this, my hand jumped to the purchase button instantly. Without a doubt I consider Homeworld the best game of all time, bar none. Ive been hoping someone would port it to modern machines for ages! I have been playing on a 2 year old Mac Mini, and aside from imperfect video smoothness in cinematics, it seems absolutely fine. No problems like others have reported. The only minor issue I ran into is that the ctrl-number keys used to assign groups are normally assigned to desktop switching on OS X. I disabled them in the system preferences, and the game has since worked flawlessly.
If you have never played homeworld, before, just buy it now. This game was lovingly crafted by true artists. Not only does it have an incredible story, excellent graphics, and outstanding sound, but it also has one of the best gameplay interfaces I have ever encounterd in an RTS game. The gameplay is also exceptionally well balanced. The missions are difficult enough to feel challenging, but not impossible.
Im disappointed at the statement that its currently single player only, as the multiplayer games were also a blast, but the game is really about the single player mode anyway. Wonderful job guys!