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I needed a lightweight solution for traveling with my 6 year old, who is in a booster, as I also had to drag around a car seat for my 3 year old. The travel vest is a great solution. It's light, can fold up relatively compactly to put in a suitcase and is pretty easy to put on and take off. My 6 year old is about 48 inches tall and 50 lbs, so I got the large size. He likes it and can help putting it on/taking it off. The tether helps keep him from sliding down in the backseat, but I found it best to tell him to sit criss cross while in the car which prevents that issue. (If you have a kid who squirms around a lot, this would not be a good choice as it is less confining than a car seat or booster seat.) The only complaint is that the price point is pretty high....but the portability makes up for it if you're going to use it frequently.
East to use my daughter likes it she fussy In the car she can't get out of it. It's a great thing to have have with a kids that have Intellectual disability and autism spectrum disorder it keeps her safe