Yes, Q21's dry tek is quite effective and easy to do. 2.3 gms from 142 grams of ACRB was possible, thats 1.61% Yield from 3 pulls over the course of 3 days. Think another pull would have yielded more but I was satified with what I got. This was my first attempt with this tek.
Freeze precip yielded nice white crystals that are very potent. They do have an oily consistency to them but they are able to be handled easily compared to the resulting goo I got from a hybrid lye tek I used my last attempt. I wasnt able to do all the steps properly on that tek though because of circumstances so I am sure that had to do with the low yield and the goo. The Q21 tek, I was able to do the entire extraction, step by step, exactly as stated, with phenomenal results.