I use them on my lcd sometimes in gh2 if outdoor. I'm not make up my mind yet if it worth of it because vf is pretty good also. I don't think its priority, if you don't have buy other junks first like rails. But don't get zacuto because they expensive and unfair to gh owners about shootout.
the first link is about a nonexistent eyecup and the other is about lcdloupe based systems - I´m interested in what´s called an eyepiece magnifier that fit´s on the eyepiece evf and magnifies the image coming out of the evf ....not the lcd - there are alot for canon/nikon systems , even olympus but none for the gh1/2 - seagull makes a cheapy maybe worth modifying