I installed a PS Engineering PM 1000II in my experimental. Other then
getting in a debate with the factory on voiding the warrenty because I
didn't purchase the wiring harness from them which I thought was kinda
bogus, the unit works great,, so far ...... The their defense, I am
sure some guys will butcher up the install and try to blame them for
any and all hiccups and thats why they probably want to sell you the
harness, altho it is almost as much as the unit itself.. I would buy
another intercom made by them for sure.. My two cents worth.

Ben
www.haaspowerair.com