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I got this for my mom for her birthday. I helped her put music on her cell phone, but ran out of storage from the main phone itself a month or two ago (she isn't tech savvy enough to do streaming music). I was a little leery since this card is a lot less expensive than what I've paid for others in the past, but I checked it on my phone before giving it to her as a present and it worked perfectly in my phone and in hers. I haven't completely filled it up, but it seems to be the genuine amount of storage it claims to be and we haven't had any issues with the phone accessing music or it being slow to transfer files.
This device has good performance for the price. gnome-disk reported read speeds up to ~94 MB/s, and write speeds around 22.6 MB/s . When writing the raspberry pi image the card, I saw speeds closer to 5 MB/s writes, your mileage may vary.
I'm attaching the benchmarks from gnome-disks uility. Overall, I'm satisfied with the value.
For safety against malware, I always first format (FAT32) a drive. Initially, both of these cards appeared to 'hang-up', but secondary attempts successfully formatted. Saw a few negative reviews based on device compatibility, but I tested (h2testw) fine on both Lenovo ThinkPad (Win10) and BeeLink GS-1 (Android 7.1): read 24GB/s write 16GB/s.
I’ve bought 7 over the course of 3 months. Comes within 2 days, nice packaging and warranty, used in 5 fire tablets and 2 android phones, great amount of space for the price, no problems mounting any of them.