Bought for my second camera an E-PM2. Almost as expensive as the camera. But the seeker makes a "toy" a reasonable full-fledged camera. Unfortunately, the eye sensor (not even with the OM-D EM5) is not working. Otherwise top notch !! Great color reproduction, excellent resolution. I can see no more pixels. No stuttering and a huge viewfinder. You can make the images great. I use it now even also at the OMD EM5 because he has sharper maps and a much larger viewfinder.
The Panasonic GX7 viewfinder is much worse to use especially for eyeglass wearers worse.