Okay, perhaps this is a little early. I started PPS-Pro(2 weeks ago) in my 40 gallon tank that I was in the process of gradually converting to a fully planted tank. The substrate is Schultz Aquatic soil mixed with the previous gravel that I had in the tank(I did not fully removed the old gravel as I did not want to screw up the bacterial colonies and restart a mini-cycle). This is topped off with a thin layer of fluorite. The lightling is 90 Watts and pretty cra*py. C02 is provided by 2 DIY bottles hooked to a ceramic glass diffuser and from the looks of it I have yet to see the diffuser release any bubbles eventhough there are no leaks and I can see the yeast/sugar/water mixture fermenting. The plants in the tank are aponogetons, Java fern, Java moss, hygrophilia compact, ambulia, cryptocornes(Cryptocoryne Wendtii and Cryptocoryne willisii). I had this set up in place for almost 2-3 months prior to PPS-Pro dosing and was only dosing with Seachem Comprehensive. With the exception of the aponogetons which were growing like crazy(I don't know what types as I sprouted these Wal-Mart bulbs in my 10 gallon and transferred the plants into the 40 gallon), the plants were not dieing but they were not growing either. 2 weeks after dosing with PPS-Pro, the Cryptocorne willisii gave off a daughter plant so it formed a runner, the hygrophilia compact took off and formed huge leaves and many side stems and roots, the java fern started forming plantlets on leaf tips. I was just about to remove the ambulia because it was doing so poorly. Much to my surprise new stems began forming and it started showing new growth. About the only thing that I noticed that was negative was the growth of brush algae, but I believe that this may have more to do with the DIY CO2 injection than PPS-Pro. Also the brush algae is not a huge problem because the otos and SAE seem to enjoy feasting on it. Diatom algae also formed but was quickly wiped out by the otos and it has since not returned.
I believe that the improved plant growth is more than coincidence and PPS-Pro had a lot do with this. I also believe that once I upgrade the lighting, convert to pressurized c02 injection, and increase plant mass, things will even look better. I know that one can always argue that the plants that I have are low maintenance, low light, and hardy plants to begin with and should do well even in less that ideal set-ups. This is true, but keep in mind that in my case, there was no growth for 2-3 months and signs of new growth only surfaced about 2 weeks after starting PPS-PRO.
Another vote of confidence for PPS-Pro. Thanks Edward.
Re: thinking about the switch EI to PPS-Pro 
Truly Amazing!! 
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