7,000 mAh with up to 140 W on a single port sounds pretty impressive. The built-in retractable cable is probably the feature I'd appreciate most, though—one less cable to carry around.
I'm curious about the actual size and weight, especially with that capacity and the 250 W combined output. Hopefully Xiaomi also puts enough emphasis on heat management and battery longevity. On paper this looks great, but I'd rather have a slightly larger power bank with sensible thermals than something chasing maximum wattage at all costs.