yeah, Koni's are the best you could buy as far as struts go (not including coilovers/tein/etc etc) but agx's are good for the money if you work on a budget
i have agx's w/ sportlines. the ride isn't harsh to me. just particularly jarring over rough roads, but that was on the 3/6 setting and that was to be expected. i have it on 2/2 now, and it feels much nicer for daily driving. (of course blow stock struts before, so anything will feel better!

) and adjusting them is a snap. i had to crawl under my car to reach the rear dials, and the front you adjust a dial with a flathead they provide.
i autocross as well, but i haven't autocrossed with the new setup, from what i can already tell it will be great. need to get a bushing kit now/sway bars and better tires/wheels. since the tires have to work harder now. hehe
if you have the money for Koni's though, i'd get them