Sorry to pour cold water in you veins, but that game is so bug ridden it practically killed my interest in it. There seems to be a memory leak somewhere (I read this) and as a result, the game will run slower and slower until you have no other option than to quit, reboot and restart. Also, the game is extremly unstable under most hardware configurations and you will probably see the crash frequency rise upwards like Apollo 13 as the game progresses. Not to mention the countles number of glitches (smash a skeleton, run off with his thigh bone, and you'll see "skeleton rebuilding routine" going haywire).
Also: Many Ultima fans hated it so much for the breach of Ultima traditions, that that was a major factor why no X was ever released.
BUT: It is a beautiful game, graphics wise. Just don't expect much of an RPG here. It's a strict linear adventure game.
In My Oh So Extremly Humble Opinion
WARNING: The following might ruin it for you, but there are some awesome screenshots here.
Just to prove some facts about glitches and how "serious" Ultima fans took that game
http://www.it-he.org/ultima9.htm