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I think many are jumping on Aptus' FaSilitor because it's promoted to act as a PGR..and with the timing of everyone figuring out that plenty of bottled nutes had harmful PGR's makes it more valuable. The science is simple..Aptus has a patented formula of Silicic acid and Boric acid that retains the most bioavailable forms possible. http://www.google.com/patents/US20120276165
I haven't used a Si product in awhile, but saw Jackmayoffer's results and became curious about Aptus' FaSilitor. If you're getting the yields and quality you need already without a Si product..there really is no good reason to use it. If you're not picky about how your Si is formulated...I wouldn't waste a dime on any of those bottles you listed, as you can score a lb of KSi in powder form for less than $20 and make your own.