The new bushing has six notches as opposed to the one notch old ones. I think you can buy them from cz-usa.com.
As far as durability n accurecy I'm not sure.
From what I have read in posts here and experienced myself, it seems that it all depends on how well you can tighten it without overtightening. The increased number of notches is supposed to make it easeir to do just that but some have been able to make adjustments at home.
The thread on the bushing of my brand new 97b began to fall apart after 190 rounds. I had adjusted it from finger loose to the next notch which proved to be too tight or if you look at it from another point of view...the bushing's thread was not strong enough to handle the snug fit during firing. There seems to be very little room for error between too loose - barrel/bushing rattling and tight enough to eliminate the rattling but not so tight that the thread of the bushing would be put under too much stress during firing. At least that's what I've learned so far.
I'm supposed to get my 97b back from warranty bushing replacement and some other work tomorrow.
You might want to do some looking around for older threads here to learn more.
Nik