Depending on the age statement....you can expect different levels. They had 6, 7, 8, 10 and 12 back then. Plus a number of different proofs.
To me, they were directly inline with many of the other bourbons of their era. Very rich, thick, viscous whiskies with plenty of corn, rye, barrel balance. You can really taste the age in the bottle. Also, the yeast that they used really brought the best out in the whiskey.
Today's product, while good, doesn't really have the depth that the versions from Bernheim old facilty had.
Some have said that there were some variations within the distillate at Old Bernheim...but, I have not encountered them(bad batches).
If you can find the dusty version...the price will be about $8 less expensive. The price recently went up a bunch. So, look deep in the shelf for a bottle with an old price tag.