So far I am really impressed with the quality of the device. Excellent materials and workmaship. Device functions great. I no longer have to swap out a lense cover or sacrificial lense. The device stays on and closed works as a daylight cover. The auto focus works great as well. Was able to ride my bike much more comfortably at higher speeds with the larger focal range. I just keep the gain at max and shrink the apature to desired light levels. The more light in the environment the better the focal range.
Haven't had to use it yet, fortunately. Will live in a padded nylon case with spare batteries and my 14.