We somehow need to switch seats in the next month so I have to finalize my decision and I'm pretty sure it will be a Diono seat. The Rainier is pretty new and I don't think our local Buy Buy Baby carries it in store, so I'm wondering if anyone has seen it in person and might be able to compare it to the Radian RXT? My main concern in deciding between the two is whether it'll fit RF for an infant in my car without having to move the passenger seat all the way up.