The head-inside single leg is an essential takedown in both wrestling and MMA. Often when one fails the head-inside, you can fake the switch to the double leg, and the head-outside single is there. This is great for wrestling, but in MMA three horrible things happens if you attempt a head-outside single:
You get stuck in a guillotine, and need to immediately pass to side control on the opposite side (quite difficult), or get choked out.
You get your back taken. (This is most common)
You bail on the leg once you go down and get triangle choked.
Are there instances of this takedown being used in high level MMA? Is it worth keeping in one's arsenal?