I applied one of the Spigens I got a few weeks ago and it has a halo which means it is a batch issue since a few people have applied theirs without the halo. Gotta file a claim with Amazon since Spigen won't respond to my messages.
None of the current phones support the fast UHS-I speeds, so you won't see those 90MB/s read/write speeds. There's no point in getting a fast card unless you intend to remove it from the phone and use a USB 3.0 card reader to do your transferring.