I was highly suspicious of this card, as the price seemed too good to be true - a microSD card I can write to at 90 MB/s for under £30?But it actually works! From my testing it appears to be a UHS-I DDR208 card, which means it supports a proprietary extension to the official UHS-I specification to increase the data transfer speed from 104 MB/s to 180 MB/s. That means you need a card reader which also supports this unofficial extension, a "UHS-I" capable reader may or may not include this.I've tested this card with five uSD card readers where I achieved the following speeds:READ:uni: 85 MB/sIntegral: 156 MB/sCalDigit dock: 85 MB/sJJC: 155 MB/sKingston MobileLite: 155 MB/sWRITE:uni: 78 MB/sIntegral: 90 MB/sCalDigit dock: 78 MB/sJJC: 95 MB/sKingston MobileLite: 98 MB/sMy thermal camera showed the card reaches temperatures of 104ºC when writing to it as these speeds though, so I don't know how long it will last.I also verified that it really has 128 GiB of storage by writing out ~126 GiB of data and then reading it back and comparing it to my originals. Some knock-off cards only contain a fraction of the storage they advertise, so when you write past the first few GiB the data further writes are discarded and you cannot read them back. Please to report this card appears to be legit!