I picked up two and had the opportunity to start using them last night. I've got side-by-side batches of cider going with different yeast strains. I dropped the Tilt devices in about an hour before I pitched the yeast. Interesting thing I've noticed is that the Tilts are both reporting the SG has increased overnight. Nothing too crazy, 1.057 to 1.059. Don't know if that is a real increase, or not. Don't know why it would be, only addition was the yeast. I'm not used to watching my fermentation so closely!