Very easy to own and maintain, parts are readily available, even here in NJ. Here's a good place in Boonton.
Packard Parts Many sources in Hemmings
The only downside is that the 115 is a six. If you're looking for a Packard a 120 with an eight is a better bet, for smooth power and the ability to keep up with highway traffic. My dad has had a 1941 120 convertible since 1969, and it's always been fun.