This thing is high quality and is designed for comfort. And if you're serious about babywearing, like as a "lifestyle" (hang on, that sounded really cheesy), and not a fashion statement, then comfort is pretty much the number one priority. Adoption specialists recommend holding and/or wearing your child for several hours a day to help facilitate bonding. When I heard hours I thought that was crazy, but really we actually do wear him hours a day, and the Ergo has saved my back and arms. I'd love to say that we hold him that much because I'm super attentive to our attachment, but it happens quite naturally because if we don't hold him he will whine at us. And then the other kids whine too because the baby's whining. So we have to. So anyway, we've got this handy green one because me and my hubs can both wear it (not too girly), though I have my eye on this one.
Another HUGE, I mean huge, reason I love it is for the ability to carry on my back. Not all carriers have that, and some are really so complicated that it's not worth it. But this one is actually really easy and comfy. I can really get stuff done (dishes, typing, etc) with Jude on my back and he's happy as a clam there. He hangs out and chews the Ergo. Oh, and here's a little bonus, the cleavage enhancer is an excellent bonus feature! Oh? Not a cleavage enhancer? Yes, it is. But I think they call it a security clip. It definitely make the whole thing feel like it's not going anywhere.
They are priced around $120 each, which is not a no-brainer for us. It was a bit of an expense, really. But it's saved us. In fact, I'll probably get another. They carry up to 45 lbs. That's like a 5 year old! So you'll get plenty of use out of it. Anyhoo, Ergo doesn't pay me or anything. I'm just passing on my experience. For a serious babywearer, this is the way to go.