well, the capacity grabs my interest... about 5mL
The
coils seem to fire a bit better (hotter?), and the although I haven't dug out my calipers, they appear to be a wider-diameter winding. Airflow is good, and the mouthpiece stays in place for mouth-holding... at least so far.
Now, they aren't clear, so you can't monitor
juice level as easily, but I would think 5mL would last most folk for a day... just top off each morning. (and if you're burning through more than 5mL/day... wow!

)
I like that they're the same diameter as the battery casing, too. The skirt around the connector adds to the overall stability of the assembly, making dropping it a non-event unlike the 510 carto.
To sum up... more vapor production (not tons more, but it's there), easier draw, large capacity.
InsaneManiac is an early adopter... he should have his today sometime... hopefully he'll chime in with his take on it.