Been a proponent of mod-fast action rods for quite a while. It wasn't that long ago when virtually all high end JDM sticks were what they call regular action. Those would be what we call mod-fast.
I find mod-fast rods to better casting rods; both for distance and accuracy. If you haven't tried one for pitching, you really should do so if you have the opportunity.
A rod with this action will also land more of the fish you hook. It has been said a lot of pro fishermen are using mod-fast rods. These guys need to boat every fish they hook. They know what it takes. Their livelihood depends on it. And, if you read this forum, you will find a bunch of fans of the Loomis MBR series rods. There's a reason for that. They land more fish.
Loomis really pushed the extra-fast thing with their BCR series of jig and worm rods. At the time, the most expensive rods you could find. They had to be the best. Right? The main thrust of their propaganda was the idea you would get a better hookset because the XF action gave you more power. Yeah? How's that work? You get into the power of the blank faster? Really? How fast is the tip of the rod moving during a hookset? How much longer does it take to move the tip another 5°? The lifting power, and thus the hook setting power, is not in the tip section of the blank.
A lot of folks drank that koolaid. Myself included. I still have several XF rods. Two Avid casting, and two spinning, all MXF. Two LTB casting MHXF and one Legend Extreme MXF. With the exception of the last one, all have been gathering dust for quite some time. And last one will now be a dust collector because I've built it's replacement.
About that; any of you interested in custom rods need to seriously consider a Point Blank from Fuji. Mine is the PB701MF. Casting, retrieving and working the bait, it feels like a fast action stick with great sensitivity. Hook a fish, and it it somehow turns into a mod-fast feeling rod. No idea how they did that, but it is sweet. I will be building more of those. For myself, if not for anybody else.