I am not using any Gilbert's or Emanuel's, but I have referred to my E&E several times for two topics -- Evidence and Secured Transactions. I have used them to review certain topics that are emphasized in my bar review materials that I don't understand well. I also have the "Law in a Flash" flashcards for those same two topics (meant to sell them, but never got around to it) and also have been using them occasionally for quick reviews of troublesome topics.
That said, I agree with Jacy85 that the emphasis of your state's bar exam is probably going to be very different than your law school courses were, so your supplements may be near useless in bar studying. I haven't referred to any of my supplements in any other topic except the two I mentioned, for instance. But in those two topics at least, they seem to be somewhat helpful.