Nah it’s very grippy. Though it does start to get slightly slick after a while, which I’m assuming is from dust, not entirely sure. When that happens, a quick clean around the edges puts you back to super grippy. And I don’t mean anything too involved, either. I literally just lick my finger, then wipe the ring off. Takes just a few seconds, and I’ve only done it maybe 2-3 times in the past 5 months.
It’s a very solid charger. Super well-built. I’m really impressed by it, far more than any others I’ve looked at.