The Leupold SX-1 Ventana has excellent optics and the plastic parts are more durable than on Nikon scopes.
At one of the ranges I go to the owner bought both Nikon Prostaff and Leupold SX-1 spotting scopes and placed them behind the firing line. After a couple years if use, the difference in build quality was clear. The a Leupold scopes held up without any issues. The plastic and rubber parts on the Nikon base and eyepiece were not durable. The base broke off and the rotating eye relief adjustment piece deformed in the heat.