The optics and glass on this unit are top notch. The red display is perfect in low light - I'd never go back to a rangefinder with a black display. Formatting the SD card for my .300 WSM was fast and easy. This unit is a rifle hunters dream - especially for those with a scope that does not have a dial system. I am also a bow hunter, and I'm giving this 4 stars because I believe there are better rangefinders out there for this style of hunting. The 2700 B will not give you just the equivalent horizontal range. It gives the actual range and then the equivalent range. This process takes about a second, and is much too slow in my opinion. That is my only complaint.
I haven't used the Rangemaster much yet -- just a bit of messing with it. Works well and I look forward to putting it to the test soon.
S&S is top notch. Wish we had such a store in WY.