To me the SD has a heavier draw and lighter vapor production than a CE-2, but then again, I mod all my CE-2s.
I guess this depends on how you modify the Fluxos...
I like fiddling for experimentation, but for everyday use I am too lazy for that. Cleaning is more than enough fiddling for me. The only mod I do on my Fluxos is the "ring-thing": get rid of the plugs, put the middle ring back on upside-down. And that only on the larger fluxos. Smaller ones don't need it most of the time.
So, that said, IMHO SD beats the Fluxos fairly significantly. More vapor, better draw (I like tighter draw, it makes me feel like I'm actually doing something; I used to smoke Capris for that same reason). And much better taste than anythings else - I think it matches dripping. And no modding required.
I did cut the cup seal down, but it wasn't necessary - in fact it caused flooding.
As far as I am concerned, SDs are perfect just the way they are. I still would like to know the logic behind the stub wicks though... Bad, can you answer that? Is there an advantage other than aesthetics? I suppose if I had a complaint about the SDs, it would be that I have to think about the position I hold them in - but that is really just a matter of habit.
Not that there are no improvements possible. I can think of a couple of things that would be neat to do...
Love, love, love my SDs. Can't wait for more to show up. I think I'll probably be vaping them almost exclusively, other than a couple of tanks like Stone and Grande.