I tried ATM Outbreak and could say that it's a total waste of money. I have used up 3 bottles (i still have one bottle remaining) and never saw any changes/improvement in my tank i.e., slow down of algae film build up in glass, less detritus build up, etc. in fact i have noticed the opposite. Plus, as per dosing instructions in the bottle, you need to use a lot of this stuff as compared to other bacteria products that only require a few drops per day or an ampoule every 15 days.
I would say Outbreak is all hype.