Works best: From birth to approx 12 month
Options: parent facing, hip carry.
Straps: super simple and secure velcro fastening, crossable Shoulder straps.
Some people like this for:
Newborns(No insert!) ,warm weather, hip carries, sharing with another adult. Simple design, very easy to use. Useful for those who have dexterity considerations.
Some people don't like this:
They're sized (though each size fits a good range).
Velcro can be a bit noisy.
The panel is often outgrown before baby reaches the maximum weight.
Instructions can be found here