I got my 10 ST's from Stormys yesterday and need to change out one carto tank later today, so will start to see how they work out. Normally with a good Boge, I change cartos in my tanks at 4-5 weeks when they start to tighten up. Thats with approx. 2 ml a day run thru each of them. I have 4 VV pv's that I use the 3Ω Boge's on that I vape on, off an on all day. The ST 1.7Ω I use on my 3- 3.7v pv's is about the same story. Dang, that sounds like a lot of juice per day, but I am using approx. figures, and I am a chain vaporer.
Glad I diy. 
