Britax Regent or Frontier?

[twinsmom]

Hi all! I am new to this group, so forgive me if this has already been addressed. I have 3.5yr old twins each in a Britax Regent. I now see the Frontier with the "true side-impact protection". The lack of the side impact wings bothered me about the Regent when I bought them, but I still thought it was a good seat. Now that the Frontier is out, I'm wondering if it's worth buying 2 new Frontiers. A lot of $$$ but maybe worth it for the kids safety? Any opinions would be greatly appreciated. Thanks!