Give this set a year and come back with a report on how you feel you have benefited from the 10k+ pages in this set.
BMC may not be the easiest set to use and the online corpus of images beats anything I have seen in hardcover but the real problem with a purchase like this may be finding the time to use all that data to your advantage. I
hope you find coins in the books that you did not know existed and are lucky enough to find specimens of those same ones.
I suspect, if you decide the set was a mistake as educational material that they will resell well.