The is a very well used carrier. I've tried to show an honest view in the pictures. The main area of wear is the piece of elastic that is used for extra security on the main buckle. All buckles are in good condition and I wouldn't hesitate to use this carrier for my baby.
It's great as a spare carrier to keep in the buggy or car or if you are travelling. The label says for use between 5.5kg and 20kg, personally I liked it from 6-18 months, but both my children are tall and heavy. You would need to use it with an infant insert (not included) for a smaller baby. It isn't as supportive as the non travel version of this style of carrier, so I wouldn't recommended it for carrying an older heavy toddler. Both my children loved it, and would fall asleep in minutes if I put it on my front and paced around.
It works equally well for front and back carry, and I especially like the way the chest strap adjusts up and down.