Trying to decide b/t the R120 or the RXT. I heard that the Diono's don't booster well and I'd probably need to buy a HBB for LO anyway so I'm thinking about saving a little $$$ and just going w/ the R120. I have a 24lb 14mo RF in a SKR that is working really well for us. Need a second for dad's car. I wanted the same one, but since they're now Diono trying to decide. I want the R120 b/c it has the extra infant padding so that if we have another LO He/she could use it when DS is done with it. Thanks