I ordered a pack of the regular ones back in Oct. but didn't like them. I couldn't get anything out of them, hardly any vapor at 3.7v on my BSB but recently I built a 5v device and decided to give them another try and they work great at 5v! The first one has lasted about a week before it became really hard to draw through. I just read that you can clean these? That's great! I guess the people raving about them were running their SB's at 6v. I wondered what was wrong, then I checked them with my meter and they read 3.2 ohms. A little high for 3.7v. I just ordered some LR and they should be good.