Currently I use the stick with a SanDisk Extreme SDHC UHS-I 8 GB (maximum read / write speed of 30 / 25MB / s specified) to a MSI 890FXA-GD70. On Windows 7 x64 H2testw delivers v1.4 the following values:
Write rate: 21.0 MB / s
Read rate: 27.9 MB / s
Write rate: 20.9 MB / s
Read rate: 36.1 MB / s
Whether limited in the write rate of the reader or the card's hard to tell, but for my purposes which is fast enough, and close enough to the specification of the card.
Otherwise, there's not much to say, except that the surface dust and dirt magically attracts, and the stick quite fragile feels what especially stands out when removing the very tight cap here would have a slightly firmer / thicker material and / or a slightly slightly more common cap not hurt if you do not want to push it broke in the long run, then it should peel off the cap side handle (what any cards in advance must be removed) - for a star deduction.