We hated the infantino sling. Yes, baby is very cramped in there. I was worried about neck support with it as well. However, we have tried our infantino baby carrier (back & front carrier), we like that MUCH better!
I put my LO in the sling once and he HATED it! So much so that now it just sits on a hook behind the bedroom door, collecting dust (anyone want it, let me know!)...I definitely want to get a Moby, but I feel they are so expensive!
Re: Infantino sling - does your LO love or hate it?