I'm not really familiar w/the RSTV's. Does the child put the vest on before getting in the car? Or is it just permanently attached to the seatbelt? How easy/quick is it to buckle/unbuckle?
Well, no seat is ever really permanently installed
but the RSTV is designed with travel in mind, so they do advertize that kids can wear it around town & mine has when we know we'll be going from bus to taxi to friend's car (she tells people it's her "parachute pack"
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Some people don't find it as user friendly as they'd hoped, but my father who has rather extensive nerve damage in his arms prefers it to traditional harnesses & I find it much quicker to "install" than a traditional carseat: the seatbelt just gets fed through the hooks: the important thing to remember is that the lap portion should be snug & you must use the top tether if it's a lap only seatbelt....
It's definitely a NICHE seat -- it has been an awesome alternative in our friend's old van in which we cannot install top tether anchors but which only has lap only belts (I can hook the top tether onto a buckled, unused seatbelt in the row behind her)
When we use it to travel a far distance where we will settle down into a family member's vehicle, I do leave the vest in the vehicle. I leave the shoulder belt in its hook & only remove 1 side of the lap portion from its hook so that she can climb in, buckle up the chest buckles on the vest, then we feed the other side of the lap portion of the seatbelt through its hook to finish buckling. Doesn't take that much more time than a traditional harness now that we've gotten used to it
How would you feel about a child in a RSTV between 2 other seats?
A highback booster would definitely provide more side impact protection, but I actually prefer my kid to use the RSTV in lieu of a booster when between 2 other seats because it eliminates her tendency to forget correct positioning when sitting amongst distracting friends, reduces forward movement (crash tests more like a harness than a booster) & she is also actually more capable of buckling herself up in the vest than in a booster -- which eliminates misuse by the other adult (if/when I'm not there).
My major complaint is that it can be hot in the summer. Because the lack of side impact protection has only been an issue in vehicles where a niche seat is necessary anyway & a booster would have been less safe (ie. lap only belt) & because the side impact protection issue becomes a non-issue by having her ride in the center. I can't open links right now, but I'm pretty sure the side impact article states that even kids without side impact protection are safer in side impacts when between other seats