I have the magma from fasttech - well made works great - agree with above posters: great RDA for flavor and vapor production.
+s: deep well, easy deck build, numerous airflow and coil build options, flavor and vapor superb.
-s: long 510 connection - doesn't fit flush on any of my mods, oozes juice because of airflow holes under coil(s).
Even with -s it is a keeper and gets daily use by me, along with my favorite to date Origen. Origen doesn't have any of the Magma -s but has a smaller well and less airflow options.
As eastwest posted great vape break RDA.