The pitchflex algo is also available for the H9 so it is not limited to the Pitchfactor. And while the H9 has a similar price point compared to the Pitchfactor, it is an incredible piece of gear with considerable flexibility.
+1
The Pitchfactor indeed does a ton, and it contains the H910/H949 algos, which once cost over $1000 to purchase alone in their rackmount unit. My guess is that, if you're buying a Pitchfactor, you are indeed getting it for much more than the Pitchflex. You are also dropping $500+ for a new one, and then realizing that you need to buy an expression/volume pedal to go with it shortly after that.
If drop-tuning is the only thing you're after, the Digitech Drop ($180) makes a lot more sense. However, I can literally play the organ intro to Mr. Crowley by Ozzy on my bass using the Pitchfactor, and it sounds just like the original! Try that with a Drop!