Not for serious runners
It’s a gimmick, nothing more, nothing less. The sleeves won’t do nothing to support or protect your knees, because that’s not how it works; a simple piece of elastic fabric is not preventing your knees from damage, or supporting them if you’ve already got knee problems. I bought two pairs of sleeves, summer and winter version, plus two shorts and one legging. And as a very experienced runner I can only say that the may look flashy, but the fit is awfull, far too many seams, everything sags (including the leggings, the sleeves and the shorts), so you might want to wear it on your way to your favorite hipster latte bar, but as for running gear it’s way beyond par. I did get a (partial) refund though, and the gear ended up in the used clothing bin.
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