The Oobr is a high back booster seat made by Clek. It is for children weighing 33-100 pounds in high back mode and 40-100 pounds in backless mode. The back is made from magnesium, and the headrest is attached with steel rods, just like your vehicle headrest. It has lower anchors to lock the booster into place with your vehicle's LATCH system.
I managed to get my hands on an Oobr to try out. First I tried a friend's daughter. She is 6 years old and weighs 45 pounds.
Then I tried Sofi. She's 5 years, 35 pounds.
Sofi is too light to be using a booster, but I am beginning to look at my options for when she is 40 pounds. So, what are my thoughts? I love that it's LATCHable, so kids don't have to remember to buckle it when they get out. I love how sturdy it is. Unfortunately, it's nearly impossible to buckle next to the Frontier 85 in my van, and the girls didn't think it was comfortable. The lapbelt is higher than we usually like to see with booster (though still acceptable). There is very little leg support, except for my short legged 5 year old. It was also very difficult to pull the shoulder belt through the belt guide when trying to buckle. All that combined with a price around $300, puts it at the bottom of my list.