The resolution of the viewfinder is very good, very dunken systembdingt in environments somewhat noisy.
At first glance, the viewfinder looks fragile, but mounted on the camera it turns out to be sufficiently stable for normal use.
Positive is the built-in proximity sensor, through this, the manual switching between display and viewfinder. The viewfinder is tilted to any angle which makes 90 degrees up in the practical use quite a positive impact.
Through the viewfinder mounted camera lost some of your handiness, but in case of need you can also quickly detach the viewfinder from the back NEX5.
In addition, it should be mentioned that simultaneous use of the viewfinder and the Aufsteckblitzgeräts is not possible since both use the same slot. For this reason, there are only 4 stars from me because just in bright Umbebungen a fill flash may sometimes be quite helpful.
For me, the acquisition has found it satisfactory. Given the high price and the advantages and disadvantages listed everyone must decide for themselves whether the purchase worthwhile.