I just noticed this thread. I installed a set of bolt on from JEGS. They were $99. All I can say is that was by far the best $99 I ever spent for two reasons.
One, the car never rode and or handled any better than the day I installed them. Made a HUGE difference in the way the car drove. Much stiffer and a more solid feel.
Second, when our car was rear ended at 45mph (we were sitting still), the FL State accident investigator who showed up on the scene took one look under our Bird and immediately asked if I had installed the frame connectors.
I told him I had done so only a few months before and he went on to tell me that I may have very well saved someone's life by doing so. You would not believe how well they held up under that hard hit from behind.
By installing the frame connectors if forced the trunk floor pan to take all the impact/damage. The investigator told me that was the best $99 I could have spent and I agree.
The five ruptured discs in my lower back however may not agree but hey, we all survived and that's all that matters!