Having the reticle in the first focal plane (FFP) has many advantages and a few drawbacks. As already mentioned, if you will be using reticle holds, then FFP is almost ALWAYS beneficial as you can use whatever magnification you want and the holds will remain the same. One of the biggest complaints about FFP optics is that for the reticle to remain useful at the lower end of the magnification, the reticle has to be made thicker so it is viewable at the low end. This typically means that the reticle will look unusually thick at max magnification. However, I've not found this to be a problem in practice with several different FFP scopes including Nightforce, Vortex, USO, Leupold, and Steiner. I was still able to shoot itty bity groups with either scope. The specific model Vortex you ask about I don't have any hands on experience with, but I doubt you'll have a problem with it being FFP.
Geb