Who's installed aftermarket anti-roll bars? How do you like them? I saw some from Progressive Technology, but wondered what the ride comfort compromise is. SR Racing has what appear to be universal fit sway bars, but that really makes me nervous. Taking an Interstate exchange loop had the back end of my Mazda3 HB rolling too much. (I just got my car 3 days ago!) Should I just wait for the Mazdaspeed bars? Thanks.