I prefer the Kid Comfort II
We purchased the Kanga Kid for our 5 month old. We liked the ability for it to double as a diaper bag and the smaller size given its lack of an external frame. However, it is not nearly as comfortable for the wearer as the Deuter Kid Comfort II for longer hauls, and our daughter (who is tall for her age), couldn't seem to find a comfortable sleeping position. Also, it is built to be worn by shorter adults (it fit my wife well at 5'3", but there was no way I was going to wear it at 6'3"). I would recommend it for short hauls around the city for infants, but if you're going to spend this much, you might as well upgrade to the Kid Comfort II, which is an amazing and adjustable pack.