There's a lot of things I think make this expansion pack worthwhile. Just another game to play, that alone would be a deal. But you can sort of "pick up" where you might have ended in NWN:OC or SoU.

I haven't had any crashing problems, and have a general run-of-the-mill system: XP2100+ with 512mb, XPSP2, DMA133 hard drive. The only thing that might be considered sub-par is the graphic card, which is an older NVidia MX420 which I've had for about three years now (64mb). But even with the video, I get good response, except in those areas where there are a huge number of scripts running, such as one battle scene near the end. luckily, those are few.

Other than that, the plot is fun, and full of unexpected twists and turns. But it allows you to follow those plot twists, such as betraying your allies. The ultimate goal seems to be the same, no matter which way you play it.

Graphics and sounds are fine, as in the original NWN. They did add a lot more cut-scenes to HotU, tho, which can get kind of annoying. Some of the cut-scenes add depth to the story, but some are just seemingly put there for eye-candy.

There's also lots more puzzles in this expansion. Some are fun, but one in particular got extremely tedious very fast. I knew exactly how to solve it, but I had to wait for in-game timing events before I could move on to the next step. I honestly cheated at that point, and just solved the puzzle. Otherwise I'd probably waste 30 or so minutes.

You can start HotU with a new character, and you'll immeadiately level him up to level 15. I'd really recommend that you play straight from OC to SoU and then HotU. You get a good feel for your character, his strengths and weaknesses. It's easy to take your newly made level 15 character and assume invicibility. I ended the OC with a level 15 half-orc barb, took him thru SoU to level 18, and ended HotU around level 22. Quite a bit of growth in there. Besides, I'm an XP hunter and level monger, so I like that kind of stuff.
There's a lot of things I think make this expansion pack worthwhile. Just another game to play, that alone would be a deal. But you can sort of "pick up" where you might have ended in NWN:OC or SoU. I haven't had any crashing problems, and have a general run-of-the-mill system: XP2100+ with 512mb, XPSP2, DMA133 hard drive. The only thing that might be considered sub-par is the graphic card, which is an older NVidia MX420 which I've had for about three years now (64mb). But even with the video, I get good response, except in those areas where there are a huge number of scripts running, such as one battle scene near the end. luckily, those are few. Other than that, the plot is fun, and full of unexpected twists and turns. But it allows you to follow those plot twists, such as betraying your allies. The ultimate goal seems to be the same, no matter which way you play it. Graphics and sounds are fine, as in the original NWN. They did add a lot more cut-scenes to HotU, tho, which can get kind of annoying. Some of the cut-scenes add depth to the story, but some are just seemingly put there for eye-candy. There's also lots more puzzles in this expansion. Some are fun, but one in particular got extremely tedious very fast. I knew exactly how to solve it, but I had to wait for in-game timing events before I could move on to the next step. I honestly cheated at that point, and just solved the puzzle. Otherwise I'd probably waste 30 or so minutes. You can start HotU with a new character, and you'll immeadiately level him up to level 15. I'd really recommend that you play straight from OC to SoU and then HotU. You get a good feel for your character, his strengths and weaknesses. It's easy to take your newly made level 15 character and assume invicibility. I ended the OC with a level 15 half-orc barb, took him thru SoU to level 18, and ended HotU around level 22. Quite a bit of growth in there. Besides, I'm an XP hunter and level monger, so I like that kind of stuff.