I've done all my own spraying for the past 15 years and in that time I've really enjoyed learning all the different chemicals we use.  In the past few years, as I've transitioned to more generics, I find myself talking about active ingredients instead of brand names.  If someone were to ask you your spray mix would you be able to tell them all the active ingredients or just the brand names?  I think I'd be ok most of the time but some of the secondary AIs might get me. I also think it has helped me better understand what does what.