I really like reading about Menger, but I have never actually read Menger - though I have always wanted to.
For a man who's read (as an amateur) a decent amount of Austrian text - are there reasons to read this book?
"As in a kaleidoscope, the constellation of forces operating in the system as a whole is ever changing." - Ludwig Lachmann
"When A Man Dies A World Goes Out of Existence" - GLS Shackle
Yes, he writes clearly and you will gain as much from reading his Principles of Economics as you will a more modern intro to Austrian econ, if not more.
Freedom of markets is positively correlated with the degree of evolution in any society...