I bought my Moby Wrap on a whim. I like the Kangaroo Korner Adjustable Fleece Pouch (I use this a lot on Sundays at church), but I wanted something that would more evenly distribute the weight over both shoulders and work for a newborn (my Ergo, which I LOVE does this, but I can't use it with Ally without the infant insert) when I went out walking and around the house.
I was glad that Serina had prepared me for the immense amount of fabric before I received the wrap. On my second try, I got it on and Ally in. Now it's not hard at all--of course, I use it daily. It really helped to go to mobywrap.com and watch the video. Ally likes to have her legs free and sleeps really soundly on my chest. She takes the best naps that way. I've used it this week at both the zoo and the Children's Museum, and she's slept the entire time.
I won't say that I don't have any back soreness. Any front carrier is going to hurt your back a bit, especially if you let your posture sag.
I highly recommend the Moby Wrap. It's not a bad price at all for how much I've used it. It's comfortable, versatile, comes in lots of colors, and it's cotton, so good in warmer weather too. When Ally has good neck control, I'll start facing her out. When she's a little older and heavier, I'll probably switch to the Ergo because it's easier on my shoulders and back.