I have used polyurethane suspension bushings on my other vehicles and never had any NVH that bothered me. To be fair, the other vehicles have more sound deadening material than the Element.
I would not recommend PU bushings in anything beyond suspension though. The NVH can become obnoxious real fast.

 

I can not recommend the Moog solid bushings. The amount of noise/vibration/harshness was incredible. So bad I went back to stock rubber. Thats my recommendation, stock & rubber.

MOOG Compliance Bushings..not so good Review

Two years ago I replaced the front factory rubber compliance bushings with the moog solid ones. At the time, and chatting on here with others that had these new bushing installed, this seemed like a great way to not have the rubber part wear out. Immediately after installing them the ride...

www.elementownersclub.com

 

I only thought about the hardness, I didn't think about noises. Thanks for the hint.

That's Powerflex's slogan:

"Upgrade your Honda Element with high performance bushings, bushings that won't cause vibration or noise and include a Lifetime Warranty!

 

I made a vid of the noise and harshness. Now with the rubber bushings it's back to normal.

 

Although I insulated the doors (highly recommended for the toaster), I don't think that this will make the chassis quieter with PU.
I tend to prefer OEM.

Thank you very much.

 

I used polyurethane bushings in another car before, it made the steering/handling more responsive but I had also upgraded suspension components at the same time including stiffer springs and struts and sway bar, so it is hard to say how much the PU bushings helped as they likely had the least affect of all the parts I put on. But my mechanic who raced cars says yes they will take up a bit of the slop in the suspension and it will be more responsive. They wont last as long as OE rubber bushings and I noticed mine squeaked a bit.