Nothing to say good

Note that physically, you can place an SD and micro-SD at the same time drive: But the reader only works if only one memory card is inserted (I expected).

Compatibilté without problems with USB slot 3 & 2 in my case on my Laptops (ASUS & Win 7 HP & ACER Tablet PC 8.1 and iconia W700P Win 8.1).

The card reader also works on Android USB OTG port on my micro tablet Asus ME302C) + cable + OTG USB Cable TechExpert micro sd 64GB (or 64GB SD); This in addition to the micro sd card up to 64GB in the tablet's micro Sd port. The backup between 2 micro sd becomes possible directly on the Android tablet without using a PC or network. OTG also works on a Smartphone HTC One V7.

I highly recommend it.
I use this drive for backups and as Android on memory extension OTG.
In my case I have not made a speed test against the integrated PC slotSD.

I also could see the huge difference in performance for fast SD cards when used on this player, and when used on the internal drive of the PC (ratio 1-4 on large files). Try it and adopt it ....

CrystalMark 3.03 64 Bit USB port on 3 drive transcend poiur fast SD card Komputerbay x600 128GB and internal SD port to PC to the figures in brackets.

94.7 MB / s (19.9) reading and 63.8 MB / s (18.6) write batch files 500 MB)
86.7 MB / s reading (19.35) and 27 MB / s (9.8) writing on file 512 kb.
6.8 MB / s (2.82) reading and 0.7 Mb / s (0.33) in writing to 4K file (not QD32)
6645 MB / s (2.84) reading and 0.912 MB / s (0.36) in writing to 4K QD32 file