Great! So far first week in use. Will evaluation customer service if I have any issues develope during use.
Strengths
Great 1520+ ....works fine, easy to install & config. Should have UPS control/shutdown config steps included in step one set up instruction.
I connected APC 1500 with USB cable and had to dig to find setting.
Tested shutdown on AC power failure and 1520+ dud controller shutdown first time.
I would not use a NAS without a UPS!