1. Chuck Wyatt is an experienced grower and a dedicated seed saver. Everyone who appreciates the taste of a good tomato -- hybrid, OP, heirloom, whatever, owes Chuck a nod of appreciation for his efforts over a span of many, many years. 2. The use of "packaged" Mycorrhiza is not in and of itself snake oil. It merits serious investigation and has appropriate applications. Wild-eyed claims by merchants of an "invented" strain (!!!!) do damage and insult the intelligence of thoughtful and experienced gardeners like Wyatt and others here. 3. I've had good luck with a VAM product sold by Don Chapman of Bio-Organics in California. I first used it two seasons ago. Chapman was helpful, non pushy, non gushy, non confrontational and gave me the impression that he was interested in providing a useful product to growers--primarily commercial orchardists. 4. After reading the recent posts on this list, I thought it might be useful to post the web address of an alternate supplier to anyone considering spending $$ on VAM products. Chapman's URL is http://www.bio-organics.com I found his prices fair and appreciated his lack of hype. He answered my questions (and I am generally considered a hard sell) in a straightforward and direct manner. He made no promises of miracles. He did not resort to jargon. He did not direct personal invective at critics. In short, I'd do business with him again. Catharine/Atlanta, zone 7b