On completion of the device, after my older son and daughter had at it for a bit, I showed it to my wife and baby. Shortly after demoing it, she said, "you know, you're not getting this back, right?" and I said "by who?" knowing that my son already wanted it. So she liked it. And the baby pretty much snatched it right out of her hands and starting talking into it, and tapping it, to make the lights (it was in color organ mode). Here's a cute video of her playing with it. I may have to make a few more...

Need I say more?