Completely silent compared to the Pro series.
I bought the 1200VA model which doesn't have a fan like the larger models that make noise due to poor quality fans.
Minimal smell, only a few days, manufactured in November 2022.
You can also install a larger 12v 12ah battery after two years when you no longer have a warranty.

It makes a noise even when you tilt it. To make it stop, you have to unplug it. I don't have an opinion on anything else as I returned it. Definitely not suitable for a bedroom.

Update:
One year later, it started smelling like burnt plastic, making a continuous beep, and not keeping the PC on during momentary power outages.
I made the mistake of buying it through Skroutz, which acts as an intermediary for communication with the store, and besides taking a long time (I've been waiting for over a week for them to contact the store), usually you have to exchange two or three emails, which greatly increases the waiting time.
It's better to buy them directly from the stores and speak to them directly. Skroutz, instead of solving, creates problems.