Just received it, the basic model of 650VA/390W. I charged it for several hours, plugged in the desktop, and did 2-3 tests. Works fine, the PC stays on. It beeps every 5" or so when it's activated. I didn't let it discharge, what I'm interested in is having a few seconds to turn off the tower during a power outage. For a device worth hundreds of euros, I paid 46 to protect it. Simple machine, just plugs, an on/off switch. No screens, no software, no USB needed. Power goes out and it stays on so we don't cry over a power supply, motherboard, etc. The only negative is that it smells a bit, that classic smell when a plastic electrical device heats up. Nothing terrible or strong, unless you sleep half a meter away from the UPS...
UPDATE after a month and a half: The minimal smell that was there at the beginning disappeared after a few days.
UPDATE2 Unfortunately, it proves to be unreliable... When I unplug it from the power source, it provides power to the PC normally. But when there's a general power outage due to the electricity company, unfortunately, it's as if it doesn't exist... I should note that sometimes it shuts down on its own and abruptly turns off the PC even though the house has power!
UPDATE3 While the house has normal power, it abruptly shut down the PC from the UPS twice within an hour! I disconnected it, of course. STAY AWAY!! The tower is more at risk from this device than from a power outage by the electricity company...

I built my first PC with the following components:

Gigabyte B450M DS3H (rev. 1.0)
AMD Ryzen 5 2600
G.Skill Aegis 16GB DDR4-3000MHz
XFX Radeon RX 580 8GB GTS XXX Edition (the 8-pin included in the package needs to be used)
LC-Power LC6550 V2.3
Crucial BX500 480GB
Cougar MX330-X

Everything connected properly and I was able to change the profile in the BIOS to set the memory speed to 3000MHz without any issues. The only problem I encountered was that the motherboard has 7 holes and the case doesn't have the ability to fit in that stand-off point. Nevertheless, I installed it with the 6 screws and it worked fine... I hope I don't have any issues in the future. As for gaming performance, I haven't had a chance to test it yet, but based on videos and what's written here, I believe it will be fine for 1080p. The quality and durability will be determined over time.

Update: I tested it on the following games: Tomb Raider (2013) at 1080p max settings with 2x MSA averaging around 70fps, Pubg Lite at 1080p ultra with Vsync at 75hz staying at 75fps, GTA V at 1080p very high settings with FXA on and MSAA x2 averaging around 65fps, and AC Odyssey at very high settings at 1080p averaging around 55fps. As for temperature, if you adjust the fans, you can easily play all games with a maximum temperature of 66 degrees. As for noise, I personally use headphones so I don't have any issues (I have 1 Arctic 120mm fan in the front and the stock fan, so 2x120mm in the front, 1 more Arctic 120mm at the back, and another 1 on top. There is the possibility to add another 120mm fan on top and a 200mm fan on the side... In terms of value for money, compared to other more expensive cards (both AMD and NVIDIA), this specific one was purchased at 167€ and I'm satisfied with it. Also, in the future, if I overclock the CPU and GPU, it will perform even better!

Update: There have been some minor interruptions in simple usage and the PC remained on during simple usage. Today, at some point while I was playing, there was a complete power outage and unfortunately, the PC couldn't stay on, but luckily nothing was damaged. (According to the power supply calculator, with my components and a 22'' LG monitor, it shows that I consume 416 watts during gaming, even though the UPS says it can handle 480 watts/850 volts. So, I don't recommend it for a PC, maybe for a TV, router... But again, I can't say for sure.