I removed my isoraters. I was told that it'll make more harsh ride and makes it noisier. But in all honesty, i really really do not notice anything different.
Springs are under tremendous tention. just drive it up and down will not make it move around regardless of rubber isorater is in place or not. there for no noise.
I understand that there are some people who would report that car developped some noise after removing isoraters. To me I would think thats because your lowering it, and putting more stress on suspension components. Having isorater i think also makes ride rather mushy, as spring compress, then rubber isorater would also "give" little as well
And ride quality is determend by shocks. Not how springs are seated.
I can see that it might affect ride quality if your shocks are dead. Because if that is the case then your spring is doing all the suspending job with no dumping.
Only thing about removing isorater is that you'll lose about 1/4" ride high for each of them. By removing top and bottom isorater, i lost total for 1/2". So prepare to scrape thing or two before you get the hang of it