5 stars for the quality-price ratio. On a trip from Athens to Neapolis Laconia, they responded perfectly.

Positive: It does what you expect from a bike bag. It has reflectors to be visible at night, it's waterproof, and it can fit a lot of things.
Negative: It's annoying to remove from the bike. It's better to get one with a mechanism, like the ones from Wozinsky, Thule, and Ortlieb (not available in Greece), which allow you to lift the bag without much effort.

Turbo Negative: On steep hills, things will roll to the back of the bag and it will bend under the weight and get caught in the wheel! In my case, the bike came to a complete stop and luckily I wasn't in the middle of the road.