Actually listening to the concert, the only song I actually liked was Everyday, Everywhere with TakaAi and Reina. Reina was decent in the song, but OH MY GOD, TakaAi was A-M-A-Z-I-N-G. Definitely one of the top idol vocals out there. Holy crap. I was seriously amazed at the song, and it's the only one I've kept listening to. I never had expectations for Reina in that song because her song doesn't have much range, but she didn't completely screw up. Just went a bit flat and squeakish (it was probably out of her range just barely) on one of the "Love" vocalization parts. Otherwise, she didn't do bad.
I think Takahashi NEEDS to duet that song with Inaba because that will just equal win all over.