Haven't had a try, yet, but he's certainly behind them (as one would expect, of course), and it's obviously not a deal where a manufacturer just said, hey, can we put your name on our stuff and cut you in? Greene's word is gold as far as I'm concerned, and though this is just the sort of anecdotal remark that isn't ever very useful, I can't imagine him putting his name on anything that didn't measure up according to
his standards.
Richeson blurb here.