I just now purchased the SinFive Emigi. From the look of it, it seems to nestle pretty snugly, but it does seem on the small side. Do you think I should go with a different pair during yoga?

If you are using the Luna Beads, then there will be sounds. If you have not tried them at home yet, then no, I would not recommend wearing in yoga class because they might want to try and slip out with those movements & it can hurt badly when they peek out a little. After a whole lot of walking, my Luna Beads will just barely slide out, where the tip of the last ball is slightly outside the entrance & it's painful to try and sit down or bend over when it's out like that. It hurts very badly, in fact. So you haven't used them at home yet? I ask because surely you'd know if they made noise if you had used them at home. Also if it's your first time trying kegel balls, then I don't reocommend trying to wear them to a yoga class. It could be very distracting and plus, the worry of them trying to slide out a bit when doing movements.

It'd help to know which ball you're using. It shouldn't make sound unless it's a Luna Bead. The feeling of the balls alone would be disruptive to me if I were trying to do yoga wearing them.

I think the emigis will be great for activities in quieter rooms. The sound is very muffled with those. In my experience they're not the most effective, but everyone is different. I hope they work well for you!