Great game? Yes. Cheap? Yes (under $20).
The first enjoyable difference is the career mode. In this PC version it was a ton of fun and still very challenging. You start out just golfing with some buddies, then get on an amateur tour, then the EA professional tour and lastly the PGA Tour. The whole experience is a lot of fun.
The graphics look nice and set up the right environment for a golf game. Sometimes the golfers get all weird and end up in strange animations but it's not a turn off.
The courses are accurate and amazing to play. They did however drop my favorite course from previous games, the Highlands. There is an ability to create custom course by downloading the tool from the website which is neat (however I haven't messed with it).
The physics in the game seem accurate. In the console versions I've played (99, 2003, and 2005) the game felt arcadey in some areas, such as the spin being able to be controlled on the fly. 06 for the PC fixes the system making it much more realistic which is a plus.
The multi-player is fun as always but there aren't the 'quick fun' modes in previous games.
Another minor fault is the commentary is somewhat lacking. They basically took all of the phrases from previous games and added a few. If you've played the previous games you'll find hearing those same phrases you got tired of before quite a bit again in this version. Also the EA Trax is VERY lacking. There are about five tracks, and only one real song. 2004 featured an incredible soundtrack including one of my favorite bands, Brand New. However since this is a PC game, the ability to customize your music is there.
Tiger Woods has been the best golf-sim on the consoles, and it carries over to the PC. For only $20 there is no reason this game shouldn't be in your library as a sports fan.