First three - good reads but expect a very rocky road as the plot develops. If you liked (or read) King's collaborations with Peter Straub, The Talisman and Black House, well, it seems like there was a big wealth of ideas going on that popped up in various forms across these five books. Good idea to read them separately.
From The Waste Land and Wizard and Glass we get settled into the rules of the game, and they are mostly complicated and are struggles we all have inside us projected to external events. Not an easy nor particularly linear read, more like Alice In Wonderland for adults on acid. Which is pretty much how it was written? I dunno.
It would be one heck of a good, long reading binge.