I topped my Ruger African with a 2-7X32 Vortex Viper. I am very happy with the scope. I got the Vortex BDC reticle and although not as comprehensive as the Ziess it fits .375 Ruger ballistics very closely (using 270 gr Sp Rp.)
Function, fit, and finish are excellent, optics are crisp and clear, and eye relief is generous. All wrapped up with an excellent warranty, and competitive pricing. No complaints.
There is a short review of the scope in Optics somewhere.