I'm a vivi-nova fan too - I have a mini and a mama clearo - both metal.
But I also use my CE5's on a daily basis as well as EVODs. My pro-tank occasionally get's busted out when I feel like tasting metal and vaping nothing and sucking on it so hard my cheeks hurt...
I like the CE5 because they are my first vaping clearo, and everyone loves their first right? I get good flavor from it too, minimal dry hits. Yes, I guess you have to baby them a little bit but I just like them. I don't like it because it only holds 1.6ml
I like the EVOD because it has never leaked, easy to use, great vapor and flavor - I don't like it because it only holds 1.6 ml
I also like both of them equally, but I always go back to my vivi novas. I suppose I will eventually try carto tanks, but for right now, I'm really happy with my setup.