Willy, yes, my X-Sight 2 takes a micro SD card, and that is another issue. The new class 10 card I purchased specifically for the scope will not work, nor will another card I already had. I formatted the card through the scope and also online and it still will not work. I had a third card that works for some reason.
Question about eye relief: the eye piece and scope ring distance between turrent and ocular appears to be short. I notice that ATN includes an offset ring to position the scope more rearward. So, my overall thoughts / questions are about the eye relief and if you are having any issues with that?
Some have reported that the scope will sometimes freeze up and the only way to get it working again is to let the onboard battery run down to shut it off. Are you having issues with that? My X-Sight 2 will occasionally freeze up, not often but has two or three times. I simply unplug the external battery to power down the scope, then plug it up again and restart. With the 4k that may be a problem unless ATN fixes the freezing. I admit to not liking the internal battery feature and much prefer to have external ones that I can charge and carry with me in the field.