They will be an easier install than just the coil spring.
I chose to get my Coil-Overs instead of just the lowered spring as installation/alignment costs were the same. I bout my Voightland directly from the manufacturer and had them installed at
www.herg.net
Hope this helps with your decision. I don't see a problem with the Eibach coil-overs, as long as their new.
AC