I recently purchased a Thermion XP 50. I am more than impressed ! I did all the research prior to the purchase, looking through, seeing mounted and handling other makes etc. The fact the 'Thermion' sits on the rifle like any normal day scope is a big plus, though this was not the deciding factor. My previous foxing set-up involved a tubed NV scope, a bit of a lump sat atop the rifle, I wished to get away from having a large, awkward unit. So, the 'Thermion' does it for me, the clarity of detail out to the range you mentioned is excellent. Others will no doubt have their favoured TI scope. Best advice is to do the research. Hope this helps.