Love cork and have a strong dislike for EVA grips.
First they are the slippery as a fish after you handle only a few or get a bit of suntan oil.
Second they just look "tactical", part of flyfishing me is tradition and ambiance. EVA don't provide either.
I got to tell you I clean my cork handles after everytrip, bit of detergent and a dish sponge makes 'em look great.
Some of you mugg's "aged" rod handles scare me as bad as my older brother's socks.