im using an ATN THOR 336 3x for the time being... Thinking about upgrading to a 640... Been looking at ATN and Armasight. Both companies have similar models at similar prices. ATN has 2.5x optical w/50mm lense, armasight has 3x w/ 75mm lense. Never used an armasight so not sure which way to go... Also saw that armasight has a "pro line" coming out, any idea when that will be available? Any recommendations or info would be appreciated.