Now this the kinda of expansion is what should have been done with SOU,the last one.It it literally overflowing with new content.Adding quite a few new prestige classes(I forgot how many off hand),,ton of new spells and feats and at least a few more tilesets.More than that it lts players progress into epic levels by raising the level cap to 40,..up from 20.The included module is pretty good too,.though still not as long as the original game.it isn't perfect,.there were few things detail oriented that I would have liked to not be as they were like the Red Dragon Disiple being forcable tied to a red dragon whn it didn't have to be,..same for the Champion of Torm.
Forunately Obsidian,.the guys doing Neverwinter 2 look to be taking detail to a very high level with that game.
Anyways HOTU is a great expansion that really shouldn;'t have been the last as BW had more than enought ime to release a couple more over the last few years since this one came out.
This is Highly Reccomended to complete the game and get the most out of it.