I just paid ~ 175$ for 4 bags shipped to FLA. The new amazonia is pretty decent. It has a nice dark look where as Amazonia II was more brown. I am thinking about redoing my 20 gallon. I've had it up for almost 3 years now. Luckily I never had any of the horror stories that everyone else seems to have. My advice is don't really mess around with it too much. The more your hands are in the tank the more it will break down. Yea, it's nothing all too special. I had Eco Complete and it did just fine, I actually prefer the fact that Eco Complete doesn't break down. Although, I will say that Aquasoil has never failed me. It's been nearly 3 years and it's still kicking, never once had algae and my plants have been green since day 1. I rarely dose since they are just ferns and not really needy stem plants. Best of luck.
P.S. do you plan on straining the Aquasoil? I've noticed it has quite a bit of fine powder and it might be a good idea to filter it. Oh, and it's known for leeching a ton of ammonia in the first few months. I had some bad spikes with mine and used a filter additive to scrub the ammonia.