I haven't heard a 'peep' out of my suspension since I changed over to poly bushes and before someone else tells you it's going to ride too harsh, it's quite ok in that area too. Aside from all that it's a job you can do at home on your own without the need for a press to push the rubber bushes and sleeves back into place. There are a few "tricks of the trade" for poly bushes, but nothing mind numbing.
I'd be more inclined to take it from people who have poly installed rather than from those who've heard it from a friend of a friend. or think they remember reading it in some magazine. Better still come and look at mine if you like.
And for your reading enjoyment here's an article on
front suspension rebuilding that might be of some use as well.