The Isaac is released by pulling two rings. They have lanyards on them, or can be modified in anyway that the wearer likes. One thing that makes the Isaac easy to releases is that the pins are on the helmet, and you always find them there, so it's easy to do no matter your position. It's like reaching for your ear. AND, every single time you get out of the car, you release them. THAT's a major difference compared to say the HANS. I see the HANS guys leaving the thing attached to the helmet because it's easier that way. Too much fumbling to get it back in place and ready to roll. Trouble is, THAT becomes 'The habit" and when you need to get out NOW, after an endo when your brain is rattled (see Mid Ohio video of Joey Hand), you don't change the 'habit" and go for the quick releases. (That incident could have ended much differently if there had been one less flip and an aggressive fire developed.).
For those who are asking why the Isaac can't just be changed, it performs as well as it does because of it's design. The SFI spec MANDATES certain design, or architecture parameters be met. It requires that the loads be transferred to the body, and that means some form of S&M strapping or some yoke like thing. The issue is that the belts are now not captive, and the devices can slip free. (See numerous videos, including one of Greg Amy at Watkins Glen)
I think that, for Greg's company, it presents a very real predicament. IF they changed the design to a yoke like thing, such as the HANS or DEFENDER, but with some cool roller track and the dampers, it would indeed ROCK. BUT, it would have the same weakness* that he has clearly shown he is aware of, that the things come off the belts. So, if a guy crashes, bounces of some wall, dislodges the yoke, then slams into a concrete pillar and dies, his wife may decide that something went wrong. He was SUPPOSED to live, he was wearing this device that was SUPPOSED to save him, and WHY did he die? Didn't the device maker know this would happen? In Greg's case, he's clearly said it can and will happen. At least with the others, they're looking the other way and there's no easy fishing for a lawyer.
* It has the same weakness because our club insists that all the other crap we hook to ourselves doesn't restrain us, and that the belts MUST be free with one action.**
**I can 'see' a belt device that uses the cam lock release action and has two cables that release the Isaac pins...but I just can't design them. Even if I could, I'd have to go get such a thing certified by the SFI, which would suck, not only because it would cost a ton, but because it would be a big gamble. If they feel the design doesn't meet their criteria, you're out tens of thousands of dollars. I don't know if, knowing what I know about the politics of it all, that I'd gamble that amount.