I hadn't heard of the tile. Seems it doesn't have a replaceable battery. The keylink has a button which will play a sound on the phone but I can't see mention of that feature on the tile. The tile 'community' where other phones might locate a lost item is clever but probably will never achieve the popularity to be actually useful.
So keylink looks the fav for me for now and I'll be looking for one soon as lollipop arrives as it will also keep phone unlocked. I doubt it would be worth the small saving to go with any other non mainstream manufacturer on this kind of device.
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