In general, it is a very good sandwich maker. I got the inox one which is cheaper, but it's exactly the same model, only the color changes (as my friend ChatGPT informed me...)
I made triangle toasts --> it toasted them well and quickly and almost cut them in half.
I made square toasts --> its strong point! The plates work for regular slices, but also for those huge ones that are said to be 25% larger than normal. It toasts them nicely, crispy, they don't get squashed and the cheese doesn't spill out.
I also made waffles, with the recipe from the instruction leaflet. They turned out nice, but they came out soft like crepes. ChatGPT had told me that I shouldn't make the batter so thin, but I didn't listen because that's the recipe the leaflet gave. My mistake, I should have listened!
I didn't try the plates with the ridges, but their size is very promising: they definitely make two decent toasts and will definitely grill a sandwich-pantofla (giant sandwich) just fine.

One note: I think it toasts sandwiches quickly. I saw some reviews saying it's slow. In 5 minutes, it has clearly toasted them well. I find this perfectly fine.

Positives:
1) Very high-quality construction, you can see the difference compared to toasters priced at €15-30. It is sturdy with good materials.
2) Four seemingly quality plates that cover all needs.
3) Heats up quite quickly (not very quickly but better than the cheaper ones).
4) Can stand upright for convenience, taking up less space.
5) Very good cooking overall, both for toasts and waffles.

Negatives:
1) The main problem I face is with the plate for triangular toasts. Unfortunately, the toasts stick to the upper plate at the point where they are divided in half. So when opening the toaster, the toasts rise together and hang, and if the two slices of bread haven't stuck together (which they don't, see point 2), the ingredients spill out! I have tried butter, but it doesn't change anything.
2) The size for triangular toasts is something in between classic bread and large club sandwich bread. Thus, the classic toasts are not pressed all around and their edges do not stick. It doesn't make those "puffed" triangular toasts; it simply cuts the toast in half. It doesn't press the large ones enough either since there is a large gap between the two plates.
3) I would like it to have an on/off switch.

I give it 4 stars mainly for its quality and the many options in the plates, with a reservation for possibly increasing if the sticking issue gets resolved or decreasing if it continues or worsens!