Can't say I am overly impressed by the Clearomizers. Being able to see how much juice is left is great, and that's the main reason it interested me. My first fill on one of these though, after about 2-3 puffs, it tastes horrible. Tipping helps as people have mentioned in some reviews. Also I found purposely over-filling them to get rid of air bubbles from the start helps. The second one I filled was a little better. I will see how it goes for me, but so far I am not so impressed. The RoyalSmoker CE2 510 2.5 Ohm cartos are better these IMO, but not in love with those either. My favorite so far has really been the Genuine Joye 510 Cartomizers. I might just stick to buying those, and get an eGo-T or a Map Tank.
Anyway, I will keep trying the remaining ones I have, hopefully your experience is better than mine.
I will say that CoV's service and shipping are great though!