So my tanks turned up just over a hour ago, so been using for only a little while, but thought I would let everyone know what I think so far, 1st off, picture of my tanks, the drip tips came from some where else, but match awesome.
For people who have never used tanks, this video was most helpful covering everything you need to get started, and the tanks in the picture are all full with juice - How to fill your e-fluid tank - YouTube
First thing I noticed with the tanks, you do have to treat them with care, they do come apart easy, I did nearly lose my juice on one of the fill ups, due to me pulling the whole tank top off, and will admit, I am a bit concerned with carrying the tanks around and coming apart, so if you are looking for something you can just throw in a bag and treat rough, the tanks are not a great choice, but from watching the above video, I did find working and filling was easy.
The only difference I did to the video, I used a syringe to fill the poly fill, I still left them for 15-20 minutes to soak before using. Also I did have trouble first getting onto battery, as tank would spin when screwing onto the battery, but learned to hold the tank at the top, I hold the drip tip and top of the carto that is sticking out to screw on and off the battery and that seems to work good for me.
I am using the dual coil 2ohm carto's that came with the tanks, also got 5 replacement carto's, and also got some single coil 3ohm carto's coming, due to higher ohm's are meant better for higher volts, also went for the single coil due to not being such a higher drain on the battery.
I am using a large auto DAV set at 4.2 volts.
I wanted to try out tanks because clearo's I used could not handle going above 4 volts and I was not getting the hit/vapor I wanted from them, I also used smileo's, which I do like as can use whole volt range, but did find the flavor was muted like with normal cartos. I was concerned tanks would be the same as smileo's and be muted flavor due to the poly fill in the carto, but my concern was short lived, the vapor and flavor is awesome at 4.2 volts, even at 4.2 volts, I am getting the same amount of vapor I would from a smileo's at 4.8 volts, and finding the flavor more enhanced with the tanks. I did try the dual coil 2ohm at 4.8 volts, but it was a accident being set that high, it did not burn the carto, but not sure how long it would last at the highest voltage, so turned it back down to 4.2volts.
Tanks are my new love in vaping, and even though the tanks was expensive to start with, I think they are better off in the long run, as once you got the tanks, you just need replacement carto's, at $2.65 a piece I think they could be cheaper than smileo's, and also with the different colors with tanks, it easy to use different flavor juices and keep track of them, with the smileo's I have to write on them with a silver sharpie, so would know what was in each one.
I am not knocking smileo's, think they are great too, especially for people who just want to throw them in a pocket or bag, but the tanks still have the edge in my short experience with them.

For people who have never used tanks, this video was most helpful covering everything you need to get started, and the tanks in the picture are all full with juice - How to fill your e-fluid tank - YouTube
First thing I noticed with the tanks, you do have to treat them with care, they do come apart easy, I did nearly lose my juice on one of the fill ups, due to me pulling the whole tank top off, and will admit, I am a bit concerned with carrying the tanks around and coming apart, so if you are looking for something you can just throw in a bag and treat rough, the tanks are not a great choice, but from watching the above video, I did find working and filling was easy.
The only difference I did to the video, I used a syringe to fill the poly fill, I still left them for 15-20 minutes to soak before using. Also I did have trouble first getting onto battery, as tank would spin when screwing onto the battery, but learned to hold the tank at the top, I hold the drip tip and top of the carto that is sticking out to screw on and off the battery and that seems to work good for me.
I am using the dual coil 2ohm carto's that came with the tanks, also got 5 replacement carto's, and also got some single coil 3ohm carto's coming, due to higher ohm's are meant better for higher volts, also went for the single coil due to not being such a higher drain on the battery.
I am using a large auto DAV set at 4.2 volts.
I wanted to try out tanks because clearo's I used could not handle going above 4 volts and I was not getting the hit/vapor I wanted from them, I also used smileo's, which I do like as can use whole volt range, but did find the flavor was muted like with normal cartos. I was concerned tanks would be the same as smileo's and be muted flavor due to the poly fill in the carto, but my concern was short lived, the vapor and flavor is awesome at 4.2 volts, even at 4.2 volts, I am getting the same amount of vapor I would from a smileo's at 4.8 volts, and finding the flavor more enhanced with the tanks. I did try the dual coil 2ohm at 4.8 volts, but it was a accident being set that high, it did not burn the carto, but not sure how long it would last at the highest voltage, so turned it back down to 4.2volts.
Tanks are my new love in vaping, and even though the tanks was expensive to start with, I think they are better off in the long run, as once you got the tanks, you just need replacement carto's, at $2.65 a piece I think they could be cheaper than smileo's, and also with the different colors with tanks, it easy to use different flavor juices and keep track of them, with the smileo's I have to write on them with a silver sharpie, so would know what was in each one.
I am not knocking smileo's, think they are great too, especially for people who just want to throw them in a pocket or bag, but the tanks still have the edge in my short experience with them.