I stumbled upon Opening Master the other day and am quite tempted to buy the Golem subscription and use it with Scid.

Have you ever used their databases? If yes, can you share your thoughts please?

In particular:

• How is the quality of the compilation?
• Are there any annotated games in the database (like ChessBase)?
• Is it as large as they claim it to be?
• Does it receive proper regular updates?