While I've never used
tanks, because I just don't like the polyfil in cartos, I
have used clearos. I have had wonderful experiences with my clearos. I regularly use F-1s (they are from the ego-W set-up), "stardusts" (other than the random cracking, they're a wonderful vape), Vision 'Extremes' esp. in the 3.5ml size and the Crypto 8 (I'm kinda meh on that one, 'cause I've gotten random
juice dumps). All are EASY to clean & then reload. The stardusts can be re-wicked if you pop a coil. I've had some of my F-1s in rotation for over 3 months & they vape as well today as they did when new.
Since I really don't have an "all day vape", I don't have much use for the large capacity tanks. The 3.5ml is the only large clearo I need. I change juices throughout the day, 1 strong flavor w/ my espresso, a lighter flavor or a mint mid-day, a strong flavor after dinner, and it varies before bedtime. That's kinds why I have 12 currently in various states of fill, depending on my mood or palate.