I only used Moby for 4.5months because I left it at home before we moved abroad. I have it again and will likely use it with our newborn I'm expecting. I really enjoyed the texture of the moby and the variety of carries it offered. I also like variety of colors.
Moby has grown in popularity so there are many places to find/purchase it which means there are many resources online for assistance if you need help. I loved wearing the Moby in my daughters early months.
My complaint is that its difficult to get on easily. If I didn't put it on before I left the house and wear it while I travelled, I'd have it dragging on the ground as I tied it on afterwards. It seems minor but having to remember each time to put it on before you leave can be annoying. It also has a bit of a learning curve and can be difficult to find perfect carries for newborn-I had some anxious moments when worried I had my newborn in a bad position for her neck.
All in all, though, I thought for the price and its usage, it was a great carrier. I will have to use it again soon to remind myself if I like it more than our Ergo!