There can be. If your 2.4GHz band has too much interference from other networks, baby monitors, wireless phones, speakers, headsets, etc., and you have the adapters for 5GHz, the simultaneous dual band routers can work quite well.
Otherwise, I would have to say no, not really.
I've installed some but I don't use dual band at home. I use some extra APs, mostly for the old G devices, but one at the other end of the house to improve the N coverage. The biggest improvement that I got with N was when I went N only, WPA2, with AES encryption so that I could get past 54Mbps. (The old G devices and other lesser security types slow N down to a max speed of 54Mbps.)
I doubt I would need that then, my house has 3 cell phones and some neighbors networks but that's it. Thanks for the help.