Huntindog, you are "preaching to the choir", I am not a "fan" of it, and over the yrs have been a adamant opponent to them..
To me, it is a wasteful and useless "feature" and encourages folks to ignore the brakes that are hidden by the drum..
I would rather pull the drum and inspect/check/adjust the brakes on a regular basis. Axle manufacturers state that the brakes should be inspected/adjusted every 12K miles or once a yr which ever comes first, pretty much negating the usefulness of this system.
However, there is an overwhelming insistence that having EZ lube is not only a necessity but a requirement on this forum. Along with the insistence is the "system" is not flawed nor possibly cause issues.
I am taking a much more neutral approach to this "feature" now days and basically stating "use at your own risk" but at a min if you must use the feature, make an attempt to read and follow the instructions from the manufacturer before plugging that grease gun in to the axle.