I think poly works if you get the right brand. I believe there a company called polybush(or poly bushing or something like that) which is not to be confused with the broad term polybush used to describe the product polyurethane bushings. If I had to guess, the most expensive ones are probably better.
That said, I don't use that shit and stick with regular bushings. If the automotive industry started making all cars and trucks from the factory with them, I might reconsider. But to me it's like running synthetic oil in an old diesel engine. No way, José.
I am staying with rubber - but parts quality went off the cliff.
I am running Super Pro poly on my truck. So far so good with them. Very comfy. Haven't put many miles on them yet, but they have always worked great on my race cars in the past. They are PROBABLY better then your run of the mill poly bushes.
http://www.superpro.com.au/why-superpro
Did you get them from an American supplier? If so who.
Needs should dictate your choice - there are pros and cons to both solutions
PRO
Poly:
fast and easy to replace poly with poly (no press needed) making them simple to maintain, just plan inspection and replacement into your maintenance cycle
tunable - select from various firmness options to get the right responsiveness or stiffness
Rubber:
Long lasting due to the minimal amount of actual rubber in them (three steel rings in a radius arm bush for example) failure is usually not catastrophic - they devolve over time
Factory correct setting
CONS:
Poly:
Failure can be catastrophic to the bushing, splitting and separation is common if unchecked
Costly for the shorter lifecycle
Can be mis-matched to the truck and load making things too squishy or overly stiff
Rubber:
Labor intensive replacement - rusted in liners and seized hardware sucks
Too soft if running heavily laden expedition type truck all the time and can wear prematurely
Not adjustable (one firmness)
...requires more maintenance as the trade off.
I kind of like the clicking noise.
I kind of like the clicking noise.
Then you need some bilstein 7100s with heims!