What exactly is the difference between the various VX models? Also how well does the friction adjustments (VX-1) work on the turrets vs the standard click adjustments of other models/brands? Specifically looking at the 2-7x33 VX-1 vs purchasing a K series Weaver. No experience with Leupold other than greatly disliking one of their RX-1 rangefinders I purchased recently. Returned it for a very basic/no frills Bushnell Yardage Pro Trophy rangefinder and have been very pleased with the Bushnell. Anyhoo.......school me on the VX-1 Leupolds.