I just bought it and I am very satisfied with its features. The only issue I have encountered so far is the high-pitched noise it makes in the power supply socket (maybe it happens when it is being discharged/consumed).
Fortunately, you have the option to silence the buzzer completely when the power is interrupted, and you also have many options that make it a professional UPS (USB, Ethernet, Email/SMS notification, server, mobile web, etc.), as well as the corresponding cables.

I have purchased a previous version of this ups (powerwalker vi2200 line interactive) - essentially without the screen. This ups was the worst purchase I have made. During a mini power outage (the lights simply flickered), one of my hard drives (brand new) got fried, which was in use at the time of the outage. When I emailed them (because I had important files on that drive) asking what I could do to protect my computer from further damage in the next outage (thinking of getting an extra surge protector - what can I say, I had it for a few months when it happened), they replied that they were not responsible (because I mentioned that the computer did not shut down). Since then, in three power outages, two a while ago and one just now, the computer simply shuts down! It's as if I don't have a ups. Unfortunately - even though I supposedly did my research when I was going to buy it - I do not recommend this company (or blue walker, which is the same) to anyone.

0 value for money
0 customer service
0 safety/warranty

It's a shame, if you already have it, its autonomy (over 15 minutes) "holds" for the first six months, but if you have any drive in use.. immediately make a backup, no matter what!!
If you don't have it, don't buy it! Especially this one - I bought it expensive, thinking it would be good, my goodness..

I have connected my gaming desktop with an I7 7700K processor, its monitor, a laptop, a PlayStation, and a 50-inch LED TV.
During a power outage, it lasts for about 20 minutes.
You can easily save your work and shut down your devices properly.