Bungee Cords For Goggles - Pros/Cons?

I was thinking about getting one of those bungee cords for my goggles, but I'm not too sure... they look like they may easily slip off during a dive... but I'd love to hear some pros and cons about them from people who have used them in the past. I recently switched to Nike Remoras (from Sweedes)... and I'm loving it! Thanks.