It's not that old, @Hojae84
. Thanks for sharing your experience.
I've had two separate batches of it (one obtained via Amazon, another from a shop in the DC area) and have found it to be... average. Takes a lot of it to maintain buffering capacity and nutrient content appears to vary drastically from batch to batch. One batch I have grew really nice crypts and bacopa. The other didn't do much at all.
Both of my batches leeched ammonia at varying points. One tank was about 2PPM for a couple weeks and the other was about 4PPM for 7-8 days.
I'd use it again if someone gave it to me but I wouldn't pay for it when there are better, more affordable products readily available