At 4x on my horus scope, the reticle is so small that it is difficult to see, have to crank it up to about 7x before becoming comfortable to just use the cross hair. Thats the main disadvantage on my ffp scope, can't use it at minimum power.
At max power, the field of view is sometime too small for me that I have to back down a little and am disadvantaged if using SFP. That is if recoil is too much and am trying to gain more view of the field.
I'm not trying to argue here or saying which focal plane is king. I know this is about if ffp is worth the extra cost, this forums is also helping other folks finding out what they want to use or even know what focal plane is.
But I do know that SFP is dangerous to the uneducated shooter. Look at Cabelas selection of scopes, 99% are in SFP and a lot of 'em have reticle for long range. All the salesperson I met still don't know what focal plane, I found out the hard way. It was dangerous. Cabelas is a mile from my home and they are open til 9pm.