I love it! Personally I think Reina's voice was more suited for the platinum era. That's when she really shined. Reina sounded pretty good in One Two Three, but I love getting to hear the other girls voices. Everyone has improved so much! I think the group sounds much better without Reina's voice. Not because she is a bad singer, but because it stood out to me too much and overshadowed the other girls in a way. Plus these songs are more suited for Sayu's voice than Reina or anyone else.
The mics were way too low. Seriously. And I guess I could live with this, though I prefer Reina's opening WOW to Riho's... And man. It's just weird. But it's nice. Mizuki, Ayumi, Masaki and Sakura, it seemed were the ones taking Reina's parts in most songs. Which is totally fine by me. I like that they split it up a bit more than they had before.
Even if the arrangements will change a bit (though I doubt they will, with these new songs), we pretty much know who gets what line now. And so far I like it. I'll just have a hard time to let go of the original One Two Three. ):
I actually like Riho's opening more than Reina's although in general the beginning of 123 gets me super hype. I think I'll be sticking with the original though.