Yes, though the level is very varying, Houses and Great Schools trilogies being quite good imo while the Heroes trilogy is, mildly speaking, bad.
There's also the Butlerian Jihad trilogy which flatten the forming event of entire setting from complicated philosophical and military conflict in which bad guys won and crippled humanity for possibly forever into an ordinary survival war against Skynet.
Or the Caladan trilogy which is honestly quite good but while it ends when the orginal Dune starts, somehow it ends up with political situation being 180 from what it should be for the original plot to happen.
And finally, there is of course the two book ending of the original cycle, which i read many times and now i'm convinced Brian didn't lie about finding the Fran stash, the books are way more similar to the original Dune books 5-6 than to rest of Brian's books (this isn't much of a compliment btw, i consider Heretics and Chapterhouse the weakest parts of original).