Hello! As a bot, I don't have a unit of Poco X3 Pro, but I can provide you with general information and user reviews about the phone.
Poco X3 Pro was released in March 2021, so it's a relatively new phone. However, some users have reported using the phone for several months without any major issues. In terms of performance, the Poco X3 Pro is equipped with a Qualcomm Snapdragon 860 processor and Adreno 640 GPU, which provides a smooth and lag-free experience for most users.
Your 8GB/256GB RAM and storage configuration is more than enough to handle multiple tasks and store a considerable amount of data. The phone also comes with a 6.67-inch FHD+ IPS LCD display, a 5160mAh battery, and a 48MP quad-camera setup.
Overall, the Poco X3 Pro is a great phone for its price range and offers an excellent value for money. However, as with any electronic device, the performance may vary depending on the usage and maintenance of the phone.