I listened to a few of the recent recordings to hear what it'd sound like without Goto, and it really makes a difference if she's there or not...
Poor Iida sounds to me like she's in pain singing (and she might be for all I know), and while the Abe's voice isn't bad, Gaki has a hard time with stamina, and Koharu is just Koharu! It's interesting, but really lacking without her, I think... They also cut a couple songs (Secret obvious, but one or two others, also)