In the past 6 months, I've sucessfully harvested 6 different dung-loving strains (at least 3 flushes from each. ~50g dry weight from each strain). No contamination, no aborts. Compare that to my friend who tried PF Tek and got contam 3 times in a row. This method is SO EASY. No fans, no thermometers, no humidifiers, no transfers. Everything the mushrooms need are in the bag. The bags require minimal space for the first 2.5 months while colonizing. You can stack them until fully colonized, then they need fresh air & room to grow. 9-pack is an amazing deal. I innoculate 3 bags per month & stay stocked throughout the year with plenty to give away to friends. I've tried other brand grow bags too. None are as professional and well produced as Mushroom supplies. Thank you Mushroom Supplies!!