Joining this party a bit late....
Firstly - if experienced growers tell you STS is the way to go, well, then that is probably the way to go, I know very little but I love to experiment.
Having said that, I'm using 18ppm colloidal silver, and on day 4 I can already see sacks forming (this in itself is much faster than anticipated even if one use 30ppm) it also remains to be seen if I'll still have this smug look on my face in a week or three.
So, my opinion totally do-able and it seems to work just fine.