Modern seats are pretty damn good, for the most part. Like you see in the video, lacerations are the most common injury. Flail injuries are somewhat common too, which can be more serious in nature (broken/dislocated limbs). I’d say walking away is more common than not though. Provided the ejection was initiated within the seat envelope and the limits of physics, ie not inverted at 300’ AGL or something. From the looks of the original video, seems this guy either had pretty lucky timing or successfully timed it correctly for the brief moment the airplane was relatively upright before rolling over again.
