I seriously considered the polybush. However after quite a bit of research I could not find anything positive about them in relationship to the LR3.
The issue seems to be that the RED are too hard, therefore nearly impossible to fit, and then adversely effects the handling after installation.
At the time, I contacted the company with questions about availability of the softer ones for the LR3 and never got a response. That being said, I didn't feel that a company charging that kind of money for a kit was very professional. Let's face it, most companies can at least communicate with you before the sale, and it's after the sale that they go radio silent.
I have opted at the moment to stick with the "improved" Land Rover ones.
That being said, if you want to try them, they are available in the US through
www.lucky8llc.com
If you decide to try them, post something after you've got them fitted and tested, and let everyone know how it went.