Yep, that's a problem that I have to face as well But I think it's a positive thing, since it forces you to not have stuff all over the floor.
How well does it work on edges of furniture and such? I really can't see those to be really effective there.. plus, I guess door sills will force you to set it up in different rooms every day?
The going rate seems to be 149 EUR, or are you aware of a cheaper source?
Are you running on some kind of smooth floor, or carpet?
How well does it do with 90? corners in a room? Considering you have at least 4 of them, you don't want dust and dirt buildup there.