I'd just bought a new lens (140-600mm zoom - 35mm equivalent), and with the standard viewfinder, with distant subjects at the long end of the zoom, it was hard to confirm focus, or ensure that nothing intruded into the frame that might fool the auto-focus (trusting the focus-confirm beep is all very well, unless it's focused on a leaf you overlooked - I use the lens for birding, and I've been caught out like that once or twice).
With the magnifier, however, it makes a considerable difference, and it also renders the viewfinder information more much clearly.
For spectacle wearers, like me, the magnifier makes it hard to see the edges of the frame, but I really haven't found this a problem in use, especially since a-f and ae require the subject to be more or less centred anyway (the shot can be re-composed/cropped in Photoshop).
All things considered, a good buy.
One caveat - the standard eye-cup locks onto the viewfinder (and can't be accidentally displaced), the magnifier, for some mysterious reason, doesn't, so you need to get into the habit of making sure it's properly seated before use. Olympus - this needs a fix.
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