I am fortunate enough to own both an original 700E and the newer Vision Line. The 700E was my father's that I inherited when he passed over a decade ago. He did impart on me the importance of this engine many years ago when I was young so I do understand its historical significance to those in the hobby. However, I absolutely love running my Vision Line Hudson as the 700E stays tucked away nicely in its wooden case. It is still in very good shape but I do notice the signs of age that many have commented on regarding the durability of the metals used in its construction.
The tender of Dad's 700E warped and later crumbled like a saltine cracker. And this was in the late-1970s. I wonder if the tenders had more problems. It certainly seemed so to me, given the many replacement shells floating around.