I made a Trade-in transaction through the MPB website, during which I sent my Sony 35mm 1.8 lens. In return, I received a Canon EF 35mm f/1.4 L USM lens from the company. My Sony lens was rated by the site as being in Excellent condition and valued at €225. Although this is much lower than the average market price I found online, I accepted it because the trade-in lens was of sufficient value to me, even with an additional payment of €189, which I made. The Canon lens from MPB was rated as Heavily Used by the company. The description indicated that this rating only referred to external features and did not affect the lens's functionality. Unfortunately, the lens glass was damaged upon receipt. The Canon lens I received has significant moisture and haze in its optics, a defect not disclosed in the advertisement. I filed a complaint with MPB to cancel the transaction due to their error. I requested to return the damaged Canon lens and get back my Sony lens along with the additional €189 payment I made. MPB refused to return my Sony lens, claiming the trade-in procedure consists of two separate transactions: selling my lens to them and buying a lens from their website. They offered me a refund of €414 (the valuation of my Sony lens plus the €189 I paid) if I cancel the deal. The trade-in of this company is a scam, and nowhere in its process is it stated that it is impossible to return your gear in case of problems with the one they provide on their part. Even though you lose money, they will earn it by reselling your equipment.