The short shelf life worries me a lot because I might buy something today and not use it for a few months (hey, life gets really busy at times!), and I really don't want to worry about the shelf life of my preservative, of all things! If I buy it today, the longest shelf life my products could possibly have is a year, and that concerns me.
I don't want to have to combine my preservative with another preservative to ensure it works. And I don't have the money to spend on really expensive preservatives.
My other concern is that I want more solid information on the preservatives from the manufacturers and there seems to be less information than I'd like (for instance, can we use the Leucidals with cationic ingredients or not?) I don't know if the information is out there, but I couldn't get much even going to the manufacturer's site. (And what I've found, I've shared with you!)
I know Ecocert preservatives they probably sound more appealing if you're a company, but I make my products for fun and my loved ones, so for me, I don't think I'm changing over any time soon.
So, Katie, to sum it all up - yes, there are Ecocert preservatives that seem to be effective. Are they natural? I don't know what that means any more, but these three apparently meet the Ecocert standards, so that might be the same thing?