The double leg takedown can be an effective takedown in BJJ. But it does run the risk of putting you in a Guillotine Choke if you aren’t careful. So having a good Guillotine Choke counter is really important if you plan to use takedowns in BJJ.
In this video I give some basic details on how a simple Guillotine works and how to counter it if you’re shooting a Double Leg takedown.