Two cents:
For those who are using tanks (Vivi's, Bulltank's, and the like), try rebuilding it kung kaya niyo na mag-rebuild ng atty. Not as hard as it looks. Vivi's are much simpler though. That would solve your "bitin" sa vapor. It would be best kung may ohms checker kayo (like LRider's v2, Zmax, etc.) para magauge niyo kung anong voltage ang best sa atty niyo to avoid the burnt taste afterwards.
Dagdag reviews sa RAs and RTs:
Immortal Atomizer aka "Immortalizer" - Personally, limited ako sa build. You need to be cautious when doing a "juice catcher" build because of the framework ng body. Terminals are built for the flat "ribbon-typed" kanthal, but you can also use regular kanthals. Oh, and be cautious din sa screws ng terminals, madaling mawala yun pag nadulas. Price-wise, you can find other good/better RAs for its price.
Odysseus - Hard to build. It needs a resistance wire AND a non-resistance wire. Mashado mabusisi. Although I like the thought that you can control the flow of the juice.
Happy Vaping!