I use the 2.6-2.8s on kr808s and for me it's a good range, lots of vapor and flavor, decent TH and a warm vapor. I've also used them on an ego with an adapter but they don't perform as well due to the 3.2v-3.4v regulated voltage of the ego. I recently built a 3.7v
mod and they work great on that also. i'm using an 80pg/20vg blend. I haven't really experienced the wicking issues that others talk about, but I've made
mods to the inner seals.
The only other carto experience I have is with the normal Kanger style from V4L and cigeasy. I really like the Fluxos due to their lack of filler material. The Fluxos are GV's version of the CE2 cartos, so they are basically the same as any other vendor's CE2. I have not tried the Boge cartos, but they also get good
reviews.
I'm looking forward to trying the new GV Vortex cartos which are also fillerless with the atty coil on the bottom...should pretty much eliminate any wicking issues that the CE2s may have.