It is an excellent card specially designed for multiread/write at the same time (i.e. for smartphones/tablets with open applications). It is a class 10 card, which means it achieves at least 10mb/sec in writing. However, this specific card is better and achieves around 17mb/sec continuous writing (for large files) and around 20-22mb/sec in reading, if I remember correctly. All of this using a simple reader on a laptop. With a UHS-1/usb3 reader, it may achieve higher speeds (I read 44mb/sec write and 90mb/sec read!).

Nevertheless, I give it 4 stars instead of 5 stars because the brand ADATA is considered problematic in terms of durability. Many user reviews say that they burn out at a higher rate compared to other brands, and I have also experienced this with USB3 flash drives from the same company (I have two cases of burned out drives). My card is currently functioning normally (although with minimal usage), and I hope it stays that way for a while, but just in case, I frequently back up my data (I empty it). (initial rating: 4 stars)

UPDATE 12/2018 (rating removed and dropped to 2 stars)
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The name doesn't come without reason...

After I had removed it from my phone, when I later needed to access it to retrieve files (photos), 1 out of 4 times it showed a reading error with 5 photos/files (of course, this applies to videos and all files in general) which means it "corrupted" them, even in a partial way (you could see the files, but 1/4 were corrupted). Fortunately, I always have backups of my files (every 10-20 days, I transfer my new photos from my phone to internal and external drives).
Unfortunately, my fears turned out to be true, and I now see the "risk" of having ADATA in a critical position.

Update 30/12/2018
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For the record, by formatting it (formatting to exFAT), it showed that the error was not permanent but "temporary".

The card, in "new/fresh" recordings, seems to store the files and then they can be read normally. I hope this applies to the entire card, in all "memory slots" (they didn't extensively test the entire capacity), and I hope it lasts for a long time. However, it has downgraded in my eyes from "reliable" to "unreliable" (I wouldn't use it in my wedding camera).