It has been a life saver during the summer months and it works great. It manages to cool our 1-bed flat really well. The noise is ok, I normally worked 2-3 meters from it without being disturbed.
We sometimes had it running at night as well on minimum. It has some very light black marks on the white plastic as seen in the last photos. No damage to the casing or anywhere else, it's in great condition. The exhaust is suitable for a sliding door and I found a nice solution to insulate from the outside using a green pool noodle. The actual exhaust tube doesn't extend much for this reason. So if your exhaust area is different you might need another tube.