Appears great, but... - Burris BTS 35 2.3 - 9.2x35mm Thermal Rifle Scope

This is the only thermal scope I have owned. Hence my review is limited by that fact. The scope was exceedingly easy to get ready. Battery installation and powering up was exactly as described in the instruction manual. But, when I attempted to look at deer in a snow covered field I couldn't focus the images. I emailed Burris and promptly received a reply the there are two focus rings. Although the instructions show those, it was not made clear that both need movement. In fact, the rear focus adjusted the menu as seen on screen whereas the front largely took care of the image. I also noticed holding the scope freehand, not mounted to a rifle, presented more focus issues that when mounted. I suspect this is due to the image refresh rate. At 20°F the focus rings were exceedingly difficult to rotate. Burris informed me that the grease on the rings will make rotation difficult in cold weather. Burris gave me two sites to find aftermarket levers to attach to the rings. Whilst helpful I'd rather that Burris had the levers on the scope. I also attempted to video record. Either Burris or Opticplanet included a video cable that fit the scope but had a 2.5mm pin to RCA video/audio male connection. So I had to order an adapter. Clearly that cable is not current as it would not connect to a laptop or phone. I have not sighted this to the rifle so I cannot comment on its zeroing. Once I resolved the focus and mounted it I was able to identify deer and similar sized critters at distances out to 350 yards. I did notice that the scope requires a focus adjustment for different ranges. My focus at 150 yards gave excellent detail at that range but at 350 yards I could identify deer but lost details of ears and tails. Burris informed me that the focus has to be adjusted for ranges.