I tried looking very quickly for pictures or more in depth detail of what the "chip" was in the link, since it sounded like another resistor scam to me, and for the price on vehicles I KNOW do NOT have removable chip, I could tell it was a scam. This also leads me to believe that some of their "testimonials" are bogus.

There's no way that the guy with the 2007 Chevy Avalanche "Threw away his Hypertech 'chip', for the G-Force chip."

Resistor tricks don't work, not worth the effort, even if you can do it for free, due to the way the PCM works.

Another thing, NEVER ground the positive cable when you disconnect it from the battery, nor leave the key on when disconnecting the battery. The airbag and other related systems can see this voltage drop like a battery getting disconnected in a collision, and blow the air bags assuming that a collision is occurring. It's not guaranteed to happen, but can and has happened.
You should be disconnecting the negative side of the battery first anyway. You should also only need to disconnect the battery for about 20 seconds for any system to reset, unless you have an audio system that has a stiffening cap installed, at which point the cap should be disconnected from the vehicle side of the electrical system first, if the cap and system are installed correctly, you should only need to remove the under hood system fuse to disconnect the cap from the vehicle's electrical system.

 

wow...disconnecting the battery can cause the airbags to go off? Interesting.

 

No, you missed part of what I said, disconnecting the battery is fine, just don't ground the positive lead, or leave the ignition on while disconnecting the battery. This is what the airbag system can see as a sign of a collision.

 

sounds logical.