I don't know that I would recomend Marengo as a quality DVD company, but this double feature from them is pretty good.
First one must consider that MONOGRAM PICTURES was a poverty row studio that rarely kept many negatives around. Most prints existing today were made from negatives struck from the studio's 1940s release prints. This means they are another generation away from the original negatives.
THE CORPSE VANISHES is the weaker of the two picture wise. It is soft and people's faces are a bit washed out. There are always film scratch lines present, but they are not very distracting. The film is clean of splices and the sound is clear. As of 2003, this is the best quality transfer available for this title, about the same as the ROAN copy.
THE INVISIBLE GHOST is much better. It is quite sharp with good contrast, and almost no scratches. The sound is even better. The title card is from a 1950s re-issue by Astor Pictures and that part looks grainy & dark. But don't let that dismay you, the actual movie is good. It is also similar to the ROAN copy.
If you are a fan of these low budget, erie atmosphere films, you will thoroughly enjoy this DVD!