ᐅ Does anyone have roof windows measuring 134 cm wide by 140 cm high?

Can anyone share their experience with these? Are they difficult to open? Do such windows possibly appear too bulky? Pictures would probably say more than a thousand words here.

Thank you in advance.

We have 104x140 and they are not difficult to open, but they only open slightly by themselves – they are too heavy for that (triple-glazed Velux).