Disappointed - Vortex Diamondback 4-12x40mm Rifle Scope, 1in Tube, Second Focal Plane

I will start by saying that I have around 20 scopes, Leupold, Arken, Athlon, Vortex, Bushnell so quite a selection and I'm open to any brand. I have a few Vortex crossfire scopes and am very happy with them for the price. At the time I ordered this I also ordered a Leupold VX Freedom same magnification range. When I received them I looked through both and quickly repackaged this scope for a return. The image is not great and the distortion around the edges was horrendous!! I have the Crossfire on a 357 magnum and a 20 gauge slug gun. Both these scopes are inexpensive but give a nice image for the price. I thought this scope would be a step up but, alas, no. Maybe I just got a bad one but I cannot recommend it at all.