I currently have Front & Rear Strut Bars, (Proper ones not honda style) a C Pillar Bar and a front H Brace Tie Bar, I Also have a rear tie bar but i am yet to install it as the previous owner has stripped the bolts head off for some unknown reason so i need to get it removed,
I have noticed a huge improvement in my cars characteristics, it used to handle ok, being that i have King Springs, but i feel the car handles so much better, it just seems to be more direct.
i havent found any understeer problems, but ive only ever had that a few times, my civic seems to like to let the rear end slide out, but i guess it helps when there is no weight in there, (rear seats removed, subs removed).