I recently got the BTX and find it amazing. I find myself wanting to pull it out and use it exclusively. But its not practical to take when I'm backpack hunting. But summer scouting from the truck is fantastic. There are times when it is not very useful. Like when the heat waves are waving in the middle of the day but then again nothing is good at that time of the day except less power and magnification. I didn't get it because I needed it. I got it because I wanted it and I'm glad I got it. Its pretty sweet and using two eyes is much less strain. I also got the 1.7 magnifier and extender and as stated above it certainly gets darker on higher power but everything gets darker on higher power. It will be very useful when counting antler points several miles away. Fatrascal.