I have one, and have put about 60 rounds through it.
First they are not accurate, sometimes the ball spins off in a hook, slice, rises or sinks at will for an undetermined reason. Unpredictable. Only got about 50% hits on the side of a dump truck at 45-50 yards.
Second, they go far. Lost sight of the ones we launched at a 45 degree angle.
Third, they are a blast to shoot.
Fourth, blanks are more expensive than FMJ, at .30 - .40 each.
Fifth, don't get hit by one, it will mess you up, not a toy. Even the bounce back off a tire rolled 60 yards, quickly.
Yeah, I like it.
(Hoping to find one for the .50 BMG, that will deserve a range report. LOL )