I picked up one of the 3.5ml UDTC tanks from ECBlends with my juice order. If memory serves, they have them advertised as polypropylene. As my first tank, I liked the locking ring feature because I'm on the go quite a bit. I had it in the semi with me for a week, and just took it for a weekend vacation. No problems at all so far.
I liked it enough that I ordered the bigger one from Smoktek.com and it arrived Friday in vape mail. The little one was a bit more of a juice hog than I'm used to, but that could be carto tanks in general. I have used CE4 clearos, EVODs, and iClear 30's. So far I'm pretty sold on the carto tank in general.
I just changed out the carto that the 3.5ml "slim" came with today because the draw was getting a little tight. Probably put about 15ml of 50/50 juice through it without it flooding or burning. It's a dual coil 1.5 ohm.
The larger tank is crystal clear while the slim is opaque. You can still see the juice level, but it doesn't look as cool as the clear one IMHO.
I also like the form factor on my Tesla too. Looks hot with the gunmetal caps on the black Tesla.
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