I have the regular Avid version of this, and it was the first St. Croix rod that I tried out and started out with. This rod was what made me become a fan of St. Croix. It's a great rod. Love the taper. It also has the perfect amount of power that I look for in a spinning rod (it's not too noodle-y and not too stiff), and has good sensitivity. I have also have an Avid X (6' 6" Medium Fast casting), and I find that even though the regular Avid and the Avid X are the same blanks, for the some reason the Avid Xs are much more sensitive and better balanced. I used to think that the only difference between the regular Avid and Avid X would simply be one's personal preference of having a full cork grip or split grip. I like the traditional looking rods with full cork grips and for this reason, I have a couple of regular Avids, but in my hands, the Avid Xs feel so much better.
To answer your question, although I wouldn't primarily use this rod for roostertails and cranks, I have. With up to 1/4oz rooster tails, I've had no problems, and they seem to stay buttoned up even though it has an extra fast action because the rod's power is soft enough to allow it to bend easily to absorb the shocks. However, with squarebills, even with small ones, the rod flexes too much from the resistance. I think small jerkbaits would work fine on this rod. But really, this rod shines and excels for drop shots, ned rigs, split-shot rigs, throwing grubs on 1/8oz jigheads, neko rigging, wacky rigging and other finesse techniques.