I installed the SD Coil Pack and Livewires about two years ago. I found the Livewires to be very well made, and while they didn't fit the OEM wire holders, I just zip-tied them to keep them from rubbing on any other engine parts that might cause excess wear from rubbing.
As for the coil pack, it went bad after about a year. Zabteck was able to get Performance Distributors to replace it under warranty. However, the second coil pack went bad just last December after about another year of use. At that point, I decided I was done with the Screamin' Demon coil pack and went back to the OEM coil pack.