Finished up Dark Tower VI: Song of Susannah. Lukewarm about this one. At this point, there's quite a few continuity errors and down right plot holes that are unresolved. King himself has admitted to the continuity issues, as well as his desire to change one particular plot element that I think is about as stupid as they come (no spoilers, but if you've read the books you probably know what I'm talking about). Now I wish he had rewritten the series.I'm sure it's difficult to keep track of a story as long and complex as the Dark Tower, but it's still disappointing for me.
Either way, I'm committed now so I'll start in on Dark Tower VII: The Dark Tower when I get home from work tonight. Regardless of how King decided to end this series, it's still been a good read through the first 6 books. Worth the time investment if you're into epic quest-style westerns, with a splash of horror (much less horror than I was expecting though, which was a nice surprise).