Purchased in 2/2017 for 550 Euros (I see that since then the price has increased significantly). I have no experience with any other roof box before this one. It is used 3-4 times a year for 5-20 days each time, and loaded to its maximum capacity (possibly even exceeding the manufacturer's recommended maximum weight). With only regular maintenance of washing with soap and adding WD40 to the lock before storage, it looks (and is) like new. At the price I bought it, I consider it to be an extremely good value for money choice.

Advantages:
- Extremely easy to install and remove (I can do it myself).
- Very stable even when loaded to its limit and during sharp turns.
- It comfortably fits (for reference) the 4 bags of the Thule Go Pack Set PLUS an additional bag or 2-3 small bags AND a folded frame of a baby stroller on top.
- Very useful that it opens from both sides (although all the "expensive" ones on the market are like that).
- Very useful that the key does not return to the vertical position, so it does not come out unless all three locking points on each side are properly engaged.
- Extremely low aerodynamic noise up to 120 km/h, which is also the safety limit set by the manufacturer (the bars themselves are more noisy - at least mine are).
- It barely fits a bike rack on the bars if the roof box is installed off-center (I did not notice any pulling of the steering wheel while driving, but the aerodynamic noise increased significantly).

Disadvantages:
- Significant increase in fuel consumption (although I suspect this applies to all roof boxes).
- The price is now quite high (significantly lower, though, than solutions from well-established companies in the industry).

I highly recommend purchasing the "cover" from Kamei, which is sold separately, especially if it will be transported by one person (it protects from almost any minor impact).
Pay attention that the roof bars must have a "channel" for installation. (For example, all the factory bars from Toyota have it.)