I've got PowerFlex in all the wishbones on my 05. I really don't notice much difference between these and the rubber bushings. Maybe a very slight decrease in the time it takes to settle from transient maneuvers. There is very little rubber in the stock bushings, they are made up of mostly plastic sleeve. So they are really pretty stiff, for a stock car. There's much more urethane in the replacement bushings, no plastic sleeve.
On a reliability note, I've had a set of urethane bushings in my RX-7 for 20 years, no joke. They haven't ever needed lubrication and are as tight as they were when new. Granted, I only use the car on nice days.
My MR2 has them throughout as well. They were on the car when I bought it a couple of years ago. That car has been on the track, driven through the rain regularly, and has no garage space. It too has no suspension noises and the bushes haven't needed greasing, the ball joints in the sway bar links have, though.
All I can say as far as a recommendation is that if you are looking to stay close to stock in shock absorption, this would be a reasonable choice. I've never been in a car with monoballs for comparison.
Last edited by me73; 12-18-2013 at 09:00 PM.