I used MamaTens half way from when my contractions started until the very labour, about 8 hours in total. It really helped me, i felt like i was in control, as soon as a contaction started i pressed Contraction mode button and watched the time on the screen, especially by the end, when the contactions were getting really strong (and i only used mode A!). In the end I gave natural birth with no epidural or gas and air. Really recommend this model as it is specially designed for keeping track on contractions. Worth every penny!