I have the Historex punch & die set and other than the mini-drill, it's the best tool I've EVER purchased for the hobby... I do a lot of small scale scratchbuilding and this calls for a lot of work with circular parts such as wheels, hubs, rivet heads, 'o' rings, engine cylinders, axles, instrument faces,... There was a time when I could not afford a punch & die set and I would spend so much time doing those parts the hard way, and not often as well!
Get one! Now. You will not regret it!