I have a Vortex 5-25EBR-2c now and it is a great scope and meets my needs perfectly. I have found online a 5-25EBR-4 at a very good price. My question is can anyone compare the two scopes with each other? I know one is a FFP and the other is a SFP, all of my other scopes are SFP. Do you think I will have any issues with the FFP compared to SFP.