To me this is one of the best upgrades you can do; its necessary. If you have a M stock suspension, well, you can always go to something hard if you like to, but its correct. But the bushes are crap (too soft because the RFT tyres), they need a replace yes or yes. The feeling tyres-steering gets tight, precisse, change of directions are faster, braking is safer. And the confort ride gets no penalty at all.
Although those bushes on the pics are not the ones we change with this mod, the problem and the improve is the same, at practical impact.