I'm a big fan as well. I have mine pretty much dedicated to doing dust extraction for my ROS sander.
I emptied the bucket this past weekend and was surprised just how full of dust and how fine the dust was in the bucket.
I must have had at least 4 gallons of 'dust' in there.
I use a back as an additional back up for it, and have used it ever now and then for some other cleanup duty, so can't quite post the same 'wow' pic of a clean filter.
I would not run my sander without it it though.
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