This is a really spectrecular collection.
Really enjoyed the silverage issues. Standouts are the penned Gardner Fox issues, and the penned and drawn issues by Neal Adams. Some really awesome work here.
After finishing the silver age, the bronze age spectre is so different, much more brutal, and it plays much more into the supernatural spooky side of things. Penned by Michael Fleisher, if you have read his work on Marvel's Ghostrider, you can instantly draw some parallels as The spectre is a far more vengeful spirit than the silver age iteration. The characterization is clearly different here.
In the silver age issues, Corrigan and Spectre are separate entities, and at times need to team up to defeat the villains, whereas in the bronze age, Corrigan and Spectre are more or less one and the same person, I personally preferred the silver age in this aspect. But even so, these are really good reads, but sadly, they are mostly only 12-13 page issues. I think one is 20 pages, which is possibly the best one.
The 3 ghosts issues were also short but sweet. Doctor 13 was a interesting character, curious if he was inspired by the Bob Hope Ghost breakers film, I'd be surprised if he wasn't. There is also a panel that is clearly Colombo from the 70s detective series, which was a nice touch.
The Brave and the Bold batman issues were really solid, the standout for me was the one where the Spectre has lost Jim Corrigan's body and needs Batman't detective skills to trace it. Really well done.
And the collection finishes with 2 all star squadron issues penned by Roy Thomas, with the Spectre at the centre of the plot. These were very long but very good reads, I've never read all star squadron before, but based on these, I'd be interested in a future DC finest release if it happens.
So overall, this collection is a really great mix of different eras, most issues are really great stuff, and the artistry, especially from the silver age issues by Murphy Anderson and Neal Adams, is stunning. Highly recommend this one, quite possibly one of the best DC finests released so far.