I've not seen one, but your description sounds as though it's well made. I didn't mean to infer it's a lowly filter, but only that it's efficiency is nothing to get excited about despite their "5um" description. Like I said, I specifically asked Wix about thier equivilant offering for this "5um" filter several years ago, and was directly told that they reverse engineered the application (bought the HD filter and tested it in ISO criteria, then matched up the characteristics and performance criteria) and decided that their "normal" 51348 could do just as well.
But as you mention, construction is not an inference as to efficiency. Even syn media does not automatically generate "better" efficiency, although they most typically infer LONGER use because of capacity. Of all the HD riders I know, longer O/FCIs are not a concern, as they will often change oil once or even twice a season, after riding only a few thousands miles. But by gosh, they must have "the best" HD has to offer!
If some measure of an entity is "good", then "more" must be "better", right?
As the saying goes, there's one born every minute.