I lack the perspective of older pipe smokers, having only been smoking my pipes daily for about 2 years now, so I never got to try the original US made Carter Hall. However, I can say that after trying 80 or so different blends the current version of Carter Hall is definitely in my top 4 favorites (alongside Orlik Golden Sliced, Cornell & Diehl Pegasus, and Peterson Early Morning Pipe) and is an everyday smoke for me. No matter what season it is or the time of day or night, Carter Hall always sounds good and it tends to be what I smoke the most of overall.
I'm not sure if it's a blessing or a curse that I never got to try the original, but I am extremely fond of the current version and can only hope that it's never discontinued (especially since I haven't started deep cellaring it yet).