[Balto]

The double armbar is a very effective submission. You have to tap verbally because your arms are trapped.

It doesn't come up that frequently in regular training though. The reason being that exposing one arm far enough to be armbarred is a bad enough mistake as it is. Exposing both of your arms in that way is something that most people just would never do.

It's a good counter to the Homer Simpson choke in your guard and maybe a few neck cranks. Other than that, the situation won't come up often.