The consensus seems to be that Aquasoil 1 is a much better product. There has been problems with AS 2 breaking down in a very short time
Yes, I heard this complain (could it be dependent on a batch ? - nobody in local club seems to have this problem) and the much longer release of NH4, up to one month.
If somebody is an importer of the product and he gets upset customer calls and he does not have ADA support and would have to "eat" the cost of a replacement I can imagine he will advise against ASA2.
I also heard ASA2 has lower nutrient content. Again, as frequently, this is a "he said" information.
I like to base my decisions on facts.
I think I will combine 2 bags ASA1 (bottom layer) and my current 2 bags ASA2 upper layer. If it desintegrates, at least I will have a "powder" layer