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I thought it was tremendously helpful!
It let me see first hand the different grain/chrystal structures of different makers, and if you were paying attention, it also showed current production head thickness, web contour, cut or punched primer pocket contours, etc.
It's an accumulated knowledge thing for me, now I have scientifically prepared samples with excellent pictures to compare what I see here against! It lets me actually see where things are changing and/or going right/wrong.
I guess if someone is never going to do sectioning/inspection under magnification, it wouldn't particularly matter, but to me it lets me see where I screwed the pooch, and when I guess correctly without spending a crap load of cash to have specimens prepared and photographed.
I'm stupid happy with the results and have it saved to my 'Forever' file, and printed high res hard copies for my brass book!
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