initially my daughter hated it. even though she was a biggish baby (9lbs) she got hidden in the fabric, hated being on her back and not being ablle to look around.
it was a little better when worn by my hubby, possibly because he has no boobs to get in the way lol,
i didn't find it very comfortable, i think because i'm a bigger girl and it just didn't seem to fit properly.
now that my daughter is a bit bigger (nearly 6 months) and sitting on her own i have found it very useful for hands free carrying; side style. she sits in there snuggly and happily looks around.
all in all it took some getting used to and for a newborn like mine (who liked being upright) i would go for the baby bjorn carrier (she LOVED this from the start) but for an older baby the bubba moe is great- very compact, fits in the nappy bag, throw it in the normal wash, very high quallity material and construction.