I asked for this as a baby shower gift while expecting my 3rd child. I wanted the feature of a regular double stroller that I could also allow my nearly 3 year old to stand if she wanted to. This stroller has been amazing. Assembly was very simple. It came with a carseat bar, that accomodates most carseats. and when you no longer need the car seat, there is an easily attachable snack tray.
When I first converted from a double stroller to a sit and stand and back, it seemed confusing. But by following directions, I figured it out and can now do it with no problems.
The car seat bar also has a buckle to buckle the car seat in, so it won't tip over. Both seats have a harness. When you convert to the jumper with standing platform, there is a buckle strap going across the stroller so your toddler doesn't get hurt AS EASILY. However it is not designed to contain a child who does not know how to follow directions and rules.
The parent tray has a place for 2 drinks and a very small place for things like cell phone or keys.
The only thing I didn't like was the cargo area. While you can access it from the sides, it requires unbuttoning. with a child in the rear seat/jumper seat, you can only access it from the front, and there's not much room in there. I use my smallest diaper bag in this stroller while keeping spare supplies in my car. It is a small cargo area, so if you often take alot of stuff with you, you would probably not have enough room.
Folding it down is really simple. And it folds into a managable size, just slightly bigger than the single stroller. However with the tray on in the folded position, the tray juts out and makes storage difficult at times. But the tray is easily removable, as is the carseat bar so this is not a big issue.