I've put my WOtac next to a buckmaster and a monarch and it was running with the monarch as far as glass quality, the adjustments are much more tactile and crisp. I have yet to have it next to a Viper but I have looked through a couple and the WOtac was better in both glass and adjustments. It is generally rated better than the 3200 especially if it comes warrenty time.
I range in both MILL and MOA, I plug it into Loadbase 3.0 and it give me the range, pull up the firing solution, dial and shoot gun)I can convert back and forth at the touch of a button.