I have tried Kaplan Review Center but sorry to say, it didn't help, although they provide 2 Kaplan books and a CD upon enrollment. Kaplan has lots of study materilas which you cannot take home. You just have to read and leave it all there. Kaplan do not provide handouts to students, that's what disappointed me and more or less than 10 meetings for 3-4 hours. It depends maybe on the area where you enrolled, I don't know.
But the good thing is Kaplan Review books are excellent, all infos you need to know are there. I passed my NCLEX using the Kaplan Course book,review books, CD's as my reference. If you have these tools, then you do not need to enroll in their review center. But if you would like to try, then go for it.
I passed my NCLEX RN in Hawaii.