I have a Leupold I and III and i think they are one piece tubes also, I also have the Nikon Prostaff 2x7 mounted on a .358 and all three seem to be holding the zero, work well and are nice and bright, The Prostaff and the Leupold I are pretty close in price, no clicks on the Leupold I though. The Vari X III is just sweet, everything turns and clicks smooth, it has a feeling the other two dont have, but to be honest..they all do their job fine, go to the store and play with them, see how they look to your eye, check out the warranty, remebering that a good scope is an investment, it can go from gun to gun, and make your choice, good luck and have fun doing it.....Craig