Overall the singing and animated candle is just really fun. The product might not work as wished, but it lights up the party.
At the beginning, we couldn't really hear the birthday song and had to make people kinda quiet just to be able to hear it; it got slightly louder almost at the end of the song.
So, i guess the consistency of the product quality isn't there yet. If you're lucky, you'll get those batch that are perfect, and of course if you're not so lucky, you'll probably be disappointed a little bit, but you'll definitely still see the few seconds of 'wow' look on your friends' or family's faces.
Also, just fyi, you don't want to start this candle first and bring it out. You want to actually light up the candle in front of the bday person because it opens up and sing immediately when lighted.