Everyone reacts differently to it I suppose

#2 - I had synto drip and used gas as I was flat on my back - well almost and couldnt move around for positions - i have used it at the dentist in the past so knew i could cope with it - and it did help me go on to give birth without further intervention thankfully - very uncomfortable

Sensation - well, I was in control of how much and when, I could suck every 2nd or 3 rd contraction if I wanted to - or not at all - but hearing the little balls as other people said is soothing - but make sure they show you how to use it properly before you are potentially asking for it - so you understand the timing and how to get it to work most effectively

#3 - as natural as the sunshine - i didnt feel the need cos I could move around!!