I have it, & love it. The system needs periodic servicing to remain in optimum working condition, and I do know a lot about them.
They can't really be bench tested, but are fairly easily assessed and bench serviced.
The dash dials from 65 and up were made with cheaper materials than the 58-64 and hence break, however I have a $75 fix for those I guarantee for life. Not saying it won't break again, but if it does I'll fix it for free (less shipping).
I can service and deal with some of the ingerent issues in the underhood control servo, but shipping is a killer on those.