I bought both the 1000 TBR and Vortex to do my own comparison. I really wanted the Vortex to win out since I love their optics but the unit went bad after the first session and didn't give accurate ranges to known objects (definitely not a knock on Vortex, anybody who manufactures complex electronic devices is bound to have a few lemons). Instead of utilizing the warranty, I just returned it especially since the Leupold worked so well and better all around in my opinion. One thing I did notice when the Vortex unit worked was that the Leupold computed the range noticeably faster. The Leupold also offers more fine tuning with the TBR function, especially for rifles. As others have said, definitely get the model with the TBR function if you go this route.