I probably wouldn't buy it. SW is F2P, and those expansions are freeware (and nothing too special at that -- I've played them). If you've got a copy of SW lying around you could probably get the game to look even better graphically by using a source port (proasm is good -- better than jfsw; apparently this redux version uses resources from both source ports) and a high resolution pack. It doesn't look too impressive to me. The enhanced soundtrack is about the only worthwhile thing here.
Cant forget them steam achievements.