I really like my kit. I clean it about every half tank. I just blow it out. Also, I can't hold the button down too long on some juices because they will get a burnt taste but, they product a nice vapor and flavor with the lower burn time.
If you are a dripper using a debridged atty, they aren't going to product the same flavor or vapor you get from dripping. Also, if you have mastered the cartomizer, they may also not compare. But, they may come close.
All-in-all, I like using the tanks. I drip while I am at my desk but, they have almost completely replaced my cartos for travel. I even use them in the mornings at work, when I am constantly running around. I haven't had any leaky tanks or other issues. It did take me a while to get used to them and I found that I had to clean them more than other styles of vaping but, well worth the money.
ADD: Oh, I have found a neat trick to the tanks. When I refill a tank, I will pop it on a disconnected atty and let it sit for a few days. Then, I will turn it 180 degrees every few seconds before I go to use it (about 15-20 times). The juice gets thicker in it and there is less burn (plus a ton of flavor). Almost like a mini-steep right in the tank.