I can tell you from my vast experience (one round) that the recoil is bad. You might have noticed that the pistol grip is sloped forward and there is a reason for that. If it had the traditional grip shape (like an AR-15) the hand would be trapped in the angle and take a beating.
But it didn't shatter armor like the picture shows. AFAIK, it used the same type of AP bullet as the U.S. used, a jacket, lead mantel and penetrator core. That type of bullet doesn't penetrate by brute force, but by the bullet strike resulting in a heat dump as the energy is converted to heat, melting the plate and allowing the penetrator to go through.
Jim
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