I have the mid flex Zero G. I also have a couple of other cheaper rods with a tip flex. I guess you're right in the thought of the tip flex being with distance in mind unless you're trying to suit the rod to your casting style in which case if you have a quick short stoke you'd want the tip flex, most other strokes would go to the mid flex. The mid flex allows for a more delicate presentation then the tip flex, allows for easier short casting and you can cast pretty darn far with it too. 50 to 60 ft easy. chucked 85 ft today with the mid flex and I suck.