Hi Larry,
I had a phone conversation several years ago with one of their techs about using ethanol. He told me that there aren't any issues with the carb at all, and that older (probably decades older, now) diaphragms will eventually fail if exposed to ethanol continuously.
However.
He said that the 'soft' stuff in the pump had been replaced with new, ethanol proof material. He said that they've never certified the product for alcohol (no reason to, for certified applications), but that they switched materials because they could no longer get the non-E-proof materials since everything else runs on E-gas now. (He didn't say this, but perhaps it was for parts commonality with non-aviation products; those pumps are basically what was and is on carb'd car engines for decades.)
So there you go. Worth what you paid for it, etc. Give 'em a call; I found that they were happy to discuss the issue (without going 'on record', of course).
Charlie