I use Soxhlets a lot, quite big ones actually. But not for cannabis, only for legal stuff.
Keep in mind this technique completly extracts all compounds that are soluble in the given solvent. A continuos, complete extraction, that's what they are meant for.
Soxhlets have their place, obviously, but with Ethanol or Isoproanol (or many other common solvents) you end up with a black sludge when you try to extract cannabis. This extract needs to be further purified if you want something halfway decent for smoking or vaping. This can be done, for example by a chromatography over silica (column) or by liquid-liquid extractions (separatory funnels)
I guess if you want to ingest the product then you are fine. For smoking/vaping I would suggest other more selective methods of extraction.
You could use Diethyl-ether in a Soxhlet for better results than any alcohol can achieve, but Ether is a huge safety risk in itself. Not suggested unless you have a proper lab at hand.
True, there were days when those black sludge oils where all there was in the cannabis world I guess, but these days are over now. People want those yellow clear extracts, no chlorophyl, no waxes and fats. There are ways to get them, as we all know, but Soxhlets are for a different kind of extraction, when you want the full yield of soluble compounds, say peanut oil out of peanuts and stuff like that.
Topicals and edibles might be a diffent story though. Probably the black heavy oils work for those.
Just for the record, I don't suggest anyone do something illegal. I have no personal experience with extracting prohibited substances, just passing on general knowledge in good faith.
