I am a tad annoyed about this, I bought the ES80 standard about 3 years ago, it recently got the main end lens slightly chipped, a repair by Opticron would cost £197 (just to replace the end lens).
So I have tried ES80 ED of other people whilst out and it seemed very good,as did my original I hasten to add but the image is slightly deteriorated. Rather than pay the £197 I decided to upgrade and have purchased via warehouse Express to an ES80ED, costing me £395.
Not sure now whether I have done the right thing? Ultimately it is the birders choice but I think it is wrong that they mislead people. ED lens generally produce a better image and that is what I thought I was getting. Sounds like the extra water proof coat is all I will be getting though.