All of the three scope brands you are looking at: Burris, Leupold and ZeroTech all come with lifetime warranties so buying them secondhand does not matter. The scopes are warranted not the original owner, so buying secondhand is basically similar to buying new as they will be repaired/replaced if any problems.
ZeroTech is the new brand on the market with Leupold and Burris having a proven track record. However, ZeroTech is backed by TSA (Tasco Sales Australia), which has a long history in the scope market so the brand should last.
In regards to the Leupold VX-1 and VX-2, the VX-2 has superior lenses. The price for a s/h VX-1 3-9x is between NZ$200-$300, while a s/h VX-2 is NZ$300-$400. Don't worry about Chinese copies of VX-1 or VX-2 (these models usually not copied), but if you wish to check then send the serial number of the scope to Leupold via email and they will get back to you within 48 hours whether real.
In the end, the decision really comes down to your choice of magnification (3-9x vs 4-12x) and which scope you personally like the most...as any of the scopes will be fine.
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