Being raised with SFP, I think I can mostly address this. For me, I liked seeing a reticle that was always the same. It made me thing everything was the same, only closer or farther away. Not being able to rely on your reticle for hold over / under is actually counter productive, and slows you down.
Here is the deal: At minimum power on Most FFP scopes the reticle gets so small you do not really see any sub-tensions, you mainly see "The Reticle as a Cross in The Center" that you can easily aim with for those really coming at you fast shots. It is painfully obvious "Where You Are AT" in the power range, but it is still absolutely usable as a center cross, which is what you need at 25/50/75ish yards anyhow. Later when conditions are great, you can dial Up and see the reticle perfect and you can use it the way it is meant to be used, *WITHOUT HAVING TO LOOK AT YOUR GD'FN POWER RING!* ...sorry for caps but SFP sucks Chocolate Covered Monkey Balls for this!! When you want, need, must have fast use of your reticle that is accurate at all times that you can see to use it, then FFP is it. To say I have learned to Hate SFP would be a massive understatement. Think perhaps of a few Why Scenarios that would cause me to really feel this way
I will only say, when it bit me in the ass I was out of state on a "once in a lifetime" hunt, and I got a small touch of buck fever, a FFP scope would have saved me from myself. I truly hate SFP now days...SFP is a "liar and a fatmouth!"....heh.
Your mileage may vary!
best of *_luck_* with SFP if you choose it!