With Ego/Tornado you have a wider range of ohms you can use. I don't think a slim 510 should go below 2.6-2.8? You could go lower but you might not want to. The plastic tubes are prone to cracking and I may have read heat can add to the chances of cracking. Be careful with the top edge, don't twist onto the battery two hard (a couple of people had the bottom come out and dump
juice everywhere). Be sure to
buy the filling kit (special tip for a syringe you already own or a syringe w/ a special tip - not sure how they sell the kit)
I cannot claim they will work properly. Some people have had issues with wicking, sometimes a wick is caught under the seal and it's a delicate operation to remove and replace the seals. I plan to try them though.