I had the balloon my water broke got me to about 5cm too had my baby the next day wasn't that Discomforting.
I had the balloon inserted for 24hrs. Once it was removed my labour progressed very quickly.
It didn't work for me but it appears my results seem to be rare when talking to people. I suppose it's different for all women xx
I had a good result with the balloon. I was already 2cm when they inserted it at 11am. By 1:30pm I was having regular contractions and it fell out (5cm). 2nd baby.
I had one on the 20th it worked ! Had my baby that night but I had other complications the balloon wasn’t bad and got me to 5cm in two hours. But everyone is different.