I have played with it a little at BRU, but I haven't installed it. Neither the Tranzitions nor the Atlas have an IMMI buckle, which makes me sad because I think the one it does have (I think it is the same as the Evenflo seats) is kind of difficult to use. They also have standard hook-style LATCH, which is a deal-breaker for me in our vehicles if I want to be able to latch a booster (for the harnessed seat itself I'd just use the seatbelt). In a lot of cars the hook-style connectors aren't a problem, but in my subarus it's super painful to install and (especially) uninstall if you don't have premium connectors. Maybe it's the size of my fingers too! Who knows, but I know now that I need to use a seatbelt or premium connectors.
I was very impressed with the amount of padding, though. It felt firm but comfy. And I love how narrow it is!
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