My opinions on mag-hytec [style] diff covers has shifted a bit since Gale Banks put out his hit piece on them a few years ago; I understand it was a lot of advertising their own product and that has to be taken into consideration, but the fluid level being about the same is probably better than a ton more fluid in there. I would be worried about aeration of fluids and losing the lubricating effect the are there for.Also did diff this weekend, added a mag hytech cover with it. Only filled like 3.5 qts as i filled thru the factory fill port which was under mag hytechs dip stick marker. Sucks its not true on the capacity but at least some extra and easier changes.
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I still have my mag-hytec cover on my truck and like you said its easier to do fluid checks and changes, thats the main benefit IMO.