Here’s an excellent analysis of the Steele dossier, written by a retired CIA Senior Intelligence officer. It’s from September, but there’s a lot of good information in it.

[Editor’s Note: In this special Just Security article, highly respected former member of the CIA’s Senior Intelligence Service, John Sipher examines the Steele dossier using methods that an intelligence officer would to try to validate such information. Sipher concludes that the dossier’s information on campaign collusion is generally credible when measured against standard Russian intelligence practices, events subsequent to Steele’s reporting, and information that has become available in the nine months since Steele’s final report. The dossier, in Sipher’s view, is not without fault, including factual inaccuracies. Those errors, however, do not detract from an overarching framework that has proven to be ever more reliable as new revelations about potential Trump campaign collusion with the Kremlin and its affiliates has come to light in the nine months since Steele submitted his final report.]

I honestly don’t know if ‘John Sipher’ is his real name or a sly pseudonym.