Hi Femme - the major difference is sitting with your LO and comforting them. DH and I are not fans of CIO, either (just personal choice) and DD never actually got really upset with SS. She cried, but we could really see that the reason she was crying was because she was trying to get herself to sleep. More like protesting and cross? We stroked her head, talked to her etc so she at no point felt like we had left her. She settled very quickly and is much more content as a result.
Previously, when DD had been in her cot for any reason and couldn't see/hear one of us however briefly (normally when DH was at work a bit later, and I'd try to establish bedtime and just pop out to answer phone or something) she'd get hugely upset...it's a completely different scenario.
I was so nervous about the programme, but DD was only sleeping on me or DH...and I was more nervous that one of us would fall asleep with her on us. I was even trying out sleeping in a t-shape with her on the floor, lol (didn't work!). I am so impressed with how it's worked, because it HAS worked...for all of us! DD didn't feel abandoned, we didn't feel awful...and we are all much more with it! I feel also that she's learned a good skill by learning how to get to sleep, as she's much more refreshed and less grizzly.
It is so hard to see your LO crying, but we recognised the crying to be irritation at needing to sleep. I loved DD sleeping on me, but I was getting so tired I was paranoid I'd fall asleep...and I also wasn't firing with all cylinders during the day. She still naps on me during the day, lol. Trying to work on a couple in the cot, and one is still on me
PM - that's happened to us! I think our LOs get used to bedtime o'clock, lol