I've been running my Powerflex bushings, FCABs and RTABs and have extrememly accurate response, no noticable noise and no squeaking. I've had them for roughly 45k miles now.
I would do it all over again in a heartbeat too, if it was necessary. These things don't wear out.
/// Auto => 6-Spd Manual Conversion | Apex EC-7 | Koni/Ground Control Coilovers | Vorshlag Camber Plates | Meyle HD LCA | PowerFlex bushings | GruppeM CAI | Shark Injector | 6000k HID's and Fogs | BMW European MTechII | BMW Performance Shifter | ACS Mirrors and Rear Spoiler ///