DD HATES it. She arches her back and fusses.
Why is she uncomfortable in it, when everyone else's babies love it?
Sometimes I have my DS not liking my close carrier (if that makes you feel better). He does the arched back and crying. It's at these times that I figure he's had enough of it (particularly if he's facing me - he's big enough to face outwards - loves seeing what's happening) or he's tired but not tired enough to admit that he wants to sleep (he fights sleep at the best of times).

I also find it very troublesome to tighten and loosen, the material always gets jammed in the rings.
Sometimes I find that I need to hold the rings/material at a particular angle for it to tighten or loosen properly (if that helps). I'm not overly tall - 165cm but am a larger size (16/18) top.