HD has an inventory that has not been added to since the passing of it's founder about 6 years ago. To this day, there are many secretarials in the vintage entertainment category. I can't speak for other areas like historical, literary, or sports. There are treasures still remaining in their listings and I'm delighted with what I have acquired from them over the years.
As far as Heritage, I'm glad to know they are using PSA, etc. more often. Be careful on their autographs that have the disclaimer:
"Heritage believes the autograph in this lot to be authentic, but please know before bidding that no Certificate of Authenticity is provided."
It's usually the kiss of death as far as the lot being authentic.