Design relatively "plastic", so light (without disks!) I liked to install the drives without tools Silent External Power Supply The highlight, really strong is the interface and everything we can do with this NAS (downloadable apps). You will spend hours exploring everything if you vouler otherwise very simple installation Manuel extremely minimalist but enough to start high price but justified by the numerous features 4 drives installed without problems (in stages), except that adding disks literally takes days ... Be patient, audits discs are long, but better safe than sorry.