There is no comparison between FASA and STB or A/B. FASA is the follow-up of these standard methods and is used in conjunction with them. It is by far the most reliable way to avoid xylene evaporation, avoid lipid contamination and get the purest alkaloids out of it.

SWIM's FOAF had written a tek explaining the whole thing and what to do afterwards, it can be found here under one of the postings.