My husband and I both loving wearing our son in this carrier. It is comfortable for us and our son who is now a year old. My only complaint is the embroidery lettering on the back of the hood that says "My mom counts". It is lame and looks especially dumb when daddy is wearing the Ergo. I'm in the process of looking for a creative way to cover it up without interfering with the functionality of the hood.
Not only does this Ergo carrier make carrying my son painless, it's also very attractive to look at. Strapping the Ergo on is easy to do all by yourself. Once the straps are set to your comfort level and body-size, all you need to do is click away. It's fast & easy.
My son, however, is not a big fan of the attached hood. Instead, I just put a hat on him or carry an umbrella and voila! Easy fix.
One thing I would suggest to the Ergo makers, is to manufacture a bag to carry the Ergo in. While my Ergo's not in use, I usually throw it in the trunk of my car where my stroller lives (and sometimes it has some pretty dirty wheels). Each time I fold my stroller up and put it in the trunk, I'm afraid the dirty wheels are going to mark up my precious Ergo. Now that I think about it, I guess I could just use any old bag that's big enough, huh? :)
If you're looking for a hands-free carrier, I would definitely recommend the Ergobaby. I've used a Baby Bjorn, a sling, and the Moby, but I prefer the Ergo. It may cost more than the other alternatives, but if you have a child like mine who loves to be carried ALL the time, then the Ergo will definitely ease your back pain. While I think the Ergobaby Designer Collection does look much nicer than the other Ergo patterns and models, any Ergobaby will do. It's all just a matter of budget and preference.
Good luck and happy baby-carrying! :)