New fiber drink.....

Hi all, I'm not new here, but it's been a LONG time since I've visited.I was wondering if anyone here has tried any of the "new" fiber drinks? At least they're new to me because I'd never seen them before today. They are in a small bottle and look just like apple juice. Or at least the apple flavor kind does. I was only wondering if anyone here has tried them and how effective were they? Did you experience much bloating and gas?Hope someone has tried them...Megan