HOW is excellent.....but some will claim it to be a bit short, I enjoyed the game along with HOW greatly. It is more hack and slash and teh new monsters are pretty cool too. But I've never heard of being able to transfer your IWD/HOW characters to NWN....not yet, at least.
P.S. you can edit your message to add the "SPOILER" part you know.
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Long live H22A1!!!!!