I have used Ekster but likely won't again. It's about the thickness of two Apple Cards, very lightweight, six month battery, and makes a fairly loud noise/alarm. But the first one I had simply stopped pairing for no reason after 3-6 months. They did exchange it for free with a new one, but I find that Find My isn't always updated (sometimes it says last seen 3 Days Ago, etc). I have it on the outside of one of the Ekster wallets using one of their elastic money bands. So it isn't in the RFID blocking wallet itself. Anyhow, I think the Ekster tracker gets a majority of positive reviews, and I wouldn't consider myself a negative reviewer, but I'm ready to just go without the tracker. I can use the smaller MagSafe compatible Ekster card case instead and have it always stuck to my phone.