How good is electric rocker/swing

I used this bouncer for my second: https://shope.ee/4AUjUTLy1g For me, it helped me settle them long enough for me to do chores, pump etc during the day. If they fell asleep in it, it’s a bonus then I will transfer to cot or safe space. Sometimes, I will also use it to extend nap time. Eg: nap is 1 hour, but was interrupted at 30min mark, I will rock to sleep and place bby in the rocker to extend the sleep time, with supervision. But I will not depend on it to put my child to sleep.