I first read the Dark tower series when it was still only half published and consquently eagerly awaited the next instalment, lucky for me they were published in quick succession!
The first 3 were hard to put down even after the slow start in book 1 (the gunslinger) but perserverance paid off after the first couple of chapters.
The next 2 books just made it harder to put down and go to sleep or to work once i got into them. Although the Wizard and the glass was a bit long winded you can see the why King had to go down that path as it answers a few questions about Roland and his past.It also made him seem a bit more "human" than initially portrayed.
books 5-7 do take a bit of patience to get through at times but at least there are still reasons why you want to continue reading to the very end!
Its hard not to write a review and not give away the whole story lol.
When i first read the last in the set The Dark Tower i couldnt wait until i got to the end to find out what happened but was slightly disappointed by the end of the story as i found it a bit anti climatic but in a way it does make sense but it does make me slow down with the reading when i get to the last book mainly because i dont want the story to end again and because i know whats going ot happen.
Overall i would recommend (and have on several occasions) this set as long as you have the patience to read the whole lot.
I have had these books for years now and read them at least once a year, probably why i now need to replace two of the hardbacks. It is a extremely good read for a King fan and im sure you will want to read his other books to find out about the rest of the characters that are "slipped" into the story eg Callahan,Dinky and Ted but to name a few.
And if you need a slight break from the set try reading the short story of Roland in The little sisters of Eluria, it does tie in in a wierd way.
happy reading!
(oh on a final note where possible buy the paperbacks because the hardbacks make your arm tired)