I think this is a pretty well thought out pack. It packs down reasonably slim for transporting and storing, and set up in bout 15 seconds. When you first get it, it takes a few minutes to orient yourself around the pack, its features, and the child's harness. after you're used to it, everything deploys and adjusts easily and quickly. plus, it's got the same harness and mesh back system of lots of osprey packs.
the sunshade is a huge bonus, especially at 7k feet. it provides lots of protection, and has thick mesh on the sides that does a good job of providing some protection while still allowing your kid to look around.
The removable day pack is a cool idea, but i'm not sure if it's worth the extra forty bucks. it does provide some more storage than the poco plus, so if you're hiking alone a lot and need more space, it may be worth it. When the day pack is zipped on to the main pack, it's a little harder to get the changing pad out and especially to get it back in.
All in all, great pack, just not totally sold on removable day pack feature. maybe it'll grow on me.