Bad...
Attempted to format the card on two seperate computers, using a USB 3.0 card reader on one and a built in SD cardslot on the second. Also tried formatting the card in a camera. All three devices gave errors for both cards. Will be returning to Memory Express tomorrow.
Fast (claimed) write speeds
Micro SD size
inexpensive
Purchased two; Out of the box (pouch?) one failed to read / format under any settings; The second when formatted and tested capped out at 36 MB/s write, thats pretty good for a class 10, but nowhere close to its claimed 45 MB/s on the package
When attempting to format the card again for use it...