I have to say that we love our Moby! I've tried several other carriers, but none of them seem to have the same back support and overall comfort. I've been carrying my daughter in it since she was days old, and now at 8 months she gets excited when she sees me putting it on and tries to climb in :) She's over 18 lbs now, but it is still quite comfy to carry her in it.
I love that there are so many different holds, but you still put it on the same way every time. There is a learning curve, but once one figures that out it is super easy to put. I highly recommend this carrier; we wear ours all the time.
I've washed ours many times and the color has held, and I've also never had a problem with stretching.