This particular USB is quite good for its price. I use it for DJing, and for the thousands of demands that this profession has in terms of storage space and music library, I can say that I was left speechless. It has incredible responsiveness when it comes to searching through a huge music library and loads the tracks quickly. Now, in terms of writing speed, there is a bit of delay, but other than that, it is very decent

Purchased for €4.7. Tested on a USB 3.0 port:
* Excellent reading speed (~130 mb/s)
* Satisfactory writing speed (~45 mb/s)

In the uploaded images, you can also see a comparison with an external SSD, tested on the same USB port.

Once connected to make a backup of photos, the next time it struggles to connect. The attempt has been made on three different devices

I copied a 2GB zip file, but it's a bit slow, with an average write speed of 10mb/s and read speed of 36mb/s. Nevertheless, considering the 32GB capacity and the five-year warranty provided by Adata, I think it's a good option for backup purposes (which is what I need it for) especially for the price of five euros. If you don't need it for everyday heavy file writing, it works perfectly fine. For my needs of creating bootable images, it serves me well. However, if I wanted something faster, I would go for this: https://www.skroutz.gr/s/11910764/Adata-UV310-32GB-USB-3-0.html#reviews (which I also have).

The saying "you get what you pay for" is known to all of us!