Either way. A lot depends on what the individual courses are, who the instructors are, what your training has been thus far and what you're looking for.
I've taken some excellent, local one and two day classes from fine instructors, and those have been valuable. And I've been to Gunsite three times, and would not trade those experiences for anything.
I don't know if it would help, but I wrote this article
about my last trip to Gunsite, almost a year ago, for the Intermediate Handgun class. You might find it interesting.