I have a pair of restored quads and I love them. I would always be worrying about some component going bad on a stock unit such as the power supplies or a panel. Also look at the binding posts or the renovated versions to see of they work better with your cables. Remember that the original binding posts were close together and without a protection circuit, you could short them out easily. The other big selling point is the protection circuit for the speakers in the renovated pair...this saves you from any "oops" experiences.
Hope this helps....
Hope this helps....