Because I had bought the corresponding Eaton Nova 1250VA AVR/625W five years ago and I am comparing it with this one:

Positives: it doesn't have a fan, so it is completely silent. The previous model made quite a bit of noise due to the fan.

Negatives: its plastics do not seem to be of good quality, not in terms of durability but in terms of odor. I connected it for 48 hours and left the room due to a strong unpleasant smell. In the end, since it didn't stop smelling, I have put it out on the balcony connected until the smell stops. The model I had purchased in the past didn't smell at all from the first hour. So, three stars for this. It's a shame for Eaton because I had trust, but it seems they compromised on the quality of the plastics.

As for its functionality, I don't know yet because it's a recent purchase.