I used the CE3 and X2 clearo's from Smokeless Image. They worked okay for a day or so then was nothing but trouble from then on. I almost gave up on clearos until the T3s were released, and those saved the day! Even with as great as those were, these Kanger ProTanks are amazing. I have had absolutely no problems with them in almost a month of using them. I ordered some Kanger T3s just for backups, but am sticking with the ProTanks. The only downside is that they guzzle juice. I go through 3-4 ProTank fills a day, where one T3 would last me a day or two, but it is worth it for the taste and vape plumes.
I cannot recall off the top of my head, but I think I may have ordered a carto/tank from Fast Tech in one of my umpteen orders that I have placed over the past month. Still waiting on several orders to arrive, so I may have a pleasant surprise in one of them!
Any carto/tanks you could recommend for a newb to try? If I don't already have one on the way, I wouldn't mind trying one out in the future.