I ordered one of these plus 10 LR cartos to use with my Provari. Spoke with them on the phone to find out a few details that are not mentioned on their website.
1. Their LR cartos are ~2 ohm resistance so if you are using a Provari, these are going to be about perfect (the Provape folks recommend 2.2 ohms but good luck finding that in any carto/atty).
2. There is NO difference between the dual coil tank and the regular tank they sell. For some particular reason, they separated them because customers were getting confused. The only thing the tank you order affects (dual coil or standard/LR) is the one carto that is included - either the dual coil or the Standard/LR.
3. The new 5 ml 'tall' tank will be available next week sometime. The tube will be available as a standalone purchase for $5 and will fit the current end caps they already have on the 3 ml tank. So essentially, if you wanted to upgrade from the 3 ml to 5 ml 'tall' tank, you would order the center tube only for $5, pay either $4 or $6 for shipping (depending on which shipping method you want) for a total of about $9-$11.
4. The even newer 5.5 ml 'phat' tank is specifically designed for the Silver Bullet sold from AltSmoke.com | Personal Vaporizers | Electronic Cigarette | Ecigs | Happy Holidays!. This tank is NOT compatible with their other tank systems as it is wider than the others they have and as such, the existing end caps will NOT fit the tube. But if you are planning on using this tank with the SB, you might want to wait and order this when it becomes available (I was told over the phone, it will be available in about two weeks).
5. They will have 12 different colors (they were supposed to become available today) for all of their tank systems. I dont know if this was just end caps, the color of the tube with some transparency, both, I didnt ask much. I like clear personally.
1. Their LR cartos are ~2 ohm resistance so if you are using a Provari, these are going to be about perfect (the Provape folks recommend 2.2 ohms but good luck finding that in any carto/atty).
2. There is NO difference between the dual coil tank and the regular tank they sell. For some particular reason, they separated them because customers were getting confused. The only thing the tank you order affects (dual coil or standard/LR) is the one carto that is included - either the dual coil or the Standard/LR.
3. The new 5 ml 'tall' tank will be available next week sometime. The tube will be available as a standalone purchase for $5 and will fit the current end caps they already have on the 3 ml tank. So essentially, if you wanted to upgrade from the 3 ml to 5 ml 'tall' tank, you would order the center tube only for $5, pay either $4 or $6 for shipping (depending on which shipping method you want) for a total of about $9-$11.
4. The even newer 5.5 ml 'phat' tank is specifically designed for the Silver Bullet sold from AltSmoke.com | Personal Vaporizers | Electronic Cigarette | Ecigs | Happy Holidays!. This tank is NOT compatible with their other tank systems as it is wider than the others they have and as such, the existing end caps will NOT fit the tube. But if you are planning on using this tank with the SB, you might want to wait and order this when it becomes available (I was told over the phone, it will be available in about two weeks).
5. They will have 12 different colors (they were supposed to become available today) for all of their tank systems. I dont know if this was just end caps, the color of the tube with some transparency, both, I didnt ask much. I like clear personally.
Happy Dad's Day to all you dads and dad-like Vaporescence folks and fans! 
