Pros: - Works as specified - Holds a massive amount of data - Has never frozen in first six+ months

Cons: - Slow data transfer - Not good for 4K video

Overall Review: I purchased this Team Group 512 GB micro SD card for use with my Pono Player, and was a little wary, as they don't have a sterling reputation, but it was the cheapest option at the time. After six plus months, I am extremely happy with my purchase, as I transfer large music files on and off frequently, and never have freezes. At times the transfer is slow, but with the amount of data this card holds, I can live with that. I was running out of space, and most other options were a lot more expensive at the time.