I'm going to be the lone contrarian here... to me the M3 bushings are not enough.
I have the M3 bushings on my car as well as coil-overs and all the M3 suspension bits other than the rear lower control arms. Yet I can feel a lot of flex under load in long sweeping turns. I with I had gone with solid bushings instead of the M3 ones...
The install is more expensive than the bushings, so it's important to make the right choice from the get-go.