We did ARM towards the end of my homebirth labour, after much consideration of risks and other options.
I'd had lots of stopping and starting of (back labour) contractions and although me and DD were both doing OK, we were concerned that I was going into my third night without proper sleep and might get too tired to push when the time came.
We thought it over for 6 hours before going ahead. It speeded labour up immensely. I was in transition within 20 mins of the procedure, transition lasted for ~10 mins and I pushed for ~10 mins.
DD was born with her hand abve her head, a position she'd previously been in on scans. We think that she'd been pushing herself up off the cervix with her hand and slowing down the contractions. Once the waters were gone she could no longer do this and just came straight out.
I think that if I hadn't opted for ARM I would have eventually had to go into hospital for an epdidural and some sleep.
At the time, the back labour contractions (manageable when stomping up and down stairs but agonising on the few occasions I was lying on my back), and the fact that my mother experienced 4 failed epidurals made the idea of lying in a hospital bed to deliver DD seem more like a threat of torture than a promise of relief.
It was a hard decision. I hope I don't have to make it again.