How can I be sure that the equipment is in good condition ?


First of all, we are profesional : we must guarrantee the condition. All dealers must take back the equipment if there is something wrong with it when you receive it. 
As the material is not ours (but to pilots), we don't have to cheat. A private pilot who absolutely wants to sell his « broken » wing can cheat you. 
Paratroc refuses 30% of the wings that pilots ask us to sell, we only keep the best ones.
We take time to advice you, in order to help you making the best choice.
 
For a new product, you need to send it back as new and in original packaging. For a used, it is more difficult, beacause it has already been used. You can send it back only in case of a defect.