I have never handled any of the ER folders, so I can't say anything about the build quality, but I have to say the ER folder in the pic is as dog-ugly as the ER fixed blades. I handled all of those that ER had at BLADE Show. I thought that they were all clumsy, ill-balanced and square cornered in the handles.
That's one man's opinion. I think that most buyers can do better at their price point. I have nothing against ER, I just don't like the knives.