The handling is very easy (screw into the filter or lens thread - ready) and comfortable, seems to be made quite compact and robust, so I can keep permanently on the lens the GeLi.
Unlike some offered here plastic visors these rubber diaphragm has a large, invaluable advantage for me:
It also has a corresponding internal thread, so I can lock the lens cover easily and safely even with bolted GeLi! In theory you could use as well as still 49er filter, but I do prefer if possible directly on the lens barrel.
For my old standard lens I have actually found the GeLi my choice.
