I have 2 VapeOnly Aspire Mini Vivi Nova-S tanks which are pyrex lined. They have good flavor and don't seem to gurgle but have had problems getting them to fire. They tend to push down the center posts in my VV3's and Ego Ctwist and then they don't make connection. I don't know why that is because it never happens with any of my other clearos (protanks and Iclear 16's). I barely crank them, until I feel it start to get tight... no fire. I crank a little more, no fire. I then end up having to pull up the center post with a mini screwdriver...it pushes down to the point where none of my other clearos will connect either. Weird! I get really nervous pulling up the posts on my batteries.. can they explode if you pull them too far?