tap and die set?

I need a new tap and die set (just SAE) and would like to get a real good set. Have been looking around and ran accross a set in the Northern tool catalog that says their made out of tungsten and coated with titanium. Does anyone here have a set like this or maybe used some like this? If so do you think their worth the extra money? Every once in a while I need to tap stainless and as you all know that crap is hard. Will usually eat a regular tap or die for lunch. I wonder if these tungsten ones would stand up to stainless?