I have read allot of good stuff about ExtremeShok and seen videos of it taking out 450-500lb wild boar with 1 fatal shot of .380 or .32acp fron compacts, pocket pistols, and snubs. I think they load theres closer to like 2000fps and it has less problems with penetration or fragmenting.
I haven't heard of any reputable group either testing any or if they got their own the test results were poor. Over on GunBoards there is a member by the name of North Bender. He's done quite a bit of 9x18 ammo testing. The package he got had a round separate in handling....
Plus the adds look more like video game adds than for a serious self-defense load. If they really were the next great load they'd be providing samples to gun writers/testers for evaluations, I still haven't heard of any. The advertising spin carries on to the names of the various loads.
I just took another glance at their website. They show the exit hole in ballistic clay. The interesting part about that is that the industry standard is 10% ballistic gelatin (with some groups still using 20% I think). Now why would they use the clay and not the industry standard?
Also, what LE departments or govt. organizations are actually using this stuff? If they're saying that the said group can't be named due to national securities issues they're probably full of crap. Those types of units use proven loads, not overly hyped and un-tested rounds.