I ordered a refurbished Surface Pro from Back Market, but unfortunately, the experience was highly disappointing right out of the box.
When I first powered the device on, it couldn't even complete the initial Windows setup (Out-of-Box Experience). After selecting the United Kingdom as my region, the system immediately crashed, displayed an error screen, and entered an infinite boot loop. It was completely unusable straight from the package, indicating a severe lack of quality control and testing by the refurbisher before shipping it out.
On the positive side, reporting the issue to Back Market was straightforward, and they provided a prepaid return shipping label without any hassle. However, receiving a completely defective device on day one is incredibly frustrating. I hope they improve their device inspection process in the future.