My mom and I were at a bridal show on Sunday, and one company had a bubble machine going, I've seen it before, but I just thought I was cute, for 25 bucks I get the machine and enough fluid for 6 hours. What is your guys' ideas and thoughts on it? Did you have one? Are you having one? Are they worth getting? (are they actually on long enough, or too long? When do you even put them on? Just for kid songs or what?)TIA!