Pretty Poor for Steam Deck
I bought a few spares to go with my Genki SavePoint for my Steam Deck, and I've already burned through two of them since the heat from both the Steam Deck and SavePoint makes them detach. Conveniently the pictures on the sight show they should be put underneath the charge port of the Steam Deck for easy attachment of the SavePoint without needing a longer cord, and that's where most of the Steam Deck's heat generates. So as of now I just have my SavePoint dangling while playing.