A fellow on the range with me this morning had one of these while he was load testing rounds for his 6.5CM. Very neat piece of technology, if it wasn't $600, I might not be able to resist owning one just because.

Interestingly, after he was done, he let me play around with it. Only things I had with me were a 9mm PCC, my 4.25" Prodigy, and my P365XL, so I shot five rounds through each using my slowly diminishing stockpile of A260 147gr JHP. What surprised me is the average velocity loss from the 16" PCC to the Prodigy was only 7 FPS, clearly there's a lot of wasted space in a 16" 9mm barrel...