I for over 1 1/2 years had this NAS is now in use and am very happy with it. I use the NAS mainly as a backup and data exchange between my various PCs / notebooks. The performance made me more than surprised at this price. On average data rates (reading and writing) 30-50 MB / s indoors. Chance I was able to "measure" 63-65 MB / s. Fortunately, it is regularly supplied by Zyxel with firmware updates.
Anyone looking for a simple and inexpensive NAS is the right place.
One star deduction I admit, since the first NAS was broken. However, it was converted without difficulty by Amazon.