I would and I have. I've read both The Casual Vacancy (seriously underrated in my opinion, but that was to be expected given it was her first post-Potter book) and The Cuckoo's Calling (where she writes under the pseudonym Robert Galbraith) and both are firm favourites of mine. It all depends on what you like though. To me, JK Rowling knows how to spin a really compelling story with three dimensional characters, and this skill translates into her adult fiction.