My first experience with the CE2 was with flux...
My only problem with them was that the tubes loosened on the base enough so when I tightened them to the battery, they'd spin, which would turn the entire insides enough to break the wires.
I've since switched to clearos from MadVapes and haven't had that problem, but I don't know if it's because they're any different or because I learned not to tighten them so much.
I found a way of bringing them back from the "everything tastes the same, and it's slightly burnt" stage -- when they're empty, I syringe iso alcohol through the battery end to wash away anything loose, then I put them on a little thing I rigged up which is an 808 battery connector hooked to a 3V power source, and I let them sit and just simmer away until the coil is grey. I then syringe with iso alc again to wash away everything that's been burnt free. (Sometimes I have to burn, wash, burn, wash before the coils are free enough from gunk that I can see them clearly.)
I've been doing this for a few weeks now, and it works great for me (YMMV). I haven't noticed any degradation in the wicking, and I often chain vape (I can go through 0.5ml in less than half an hour when sitting at the computer with my PT).
I've only had one tube turn cloudy, and it was when I was using a cinnamon flavor. None of my cherry, tobacco, methol, or other flavors did that. It's still usable, but that's the last time I'm using that flavor in a clearo.