Benefits:
1. Forces you to save, if you are the type with no discipline, who will spend all your money without someone to forcefully take iy away from you.
2. Nothing else.
Disadvantages:
1. Exposes you to more risks if you hit a rough patch in life. For example, if you got laid off, and can't afford to pay the premiums anymore, you will eat a loss from the insurance savings.
2. Long term returns are almost always lower than simply DCA into an index fund, because insurance savings charge much higher fees.
3. It's a rather illiquid investment. If a better investment oppurtunity comes along, you can't switch without taking heavy losses on your insurance savings plan.