This is the standard edition of Old Greek Daniel. Be aware: this resource only contains the front matter and the Old Greek Text. If you want the Theodotion text or any of the apparatus, you'll need to buy them separately.

For whatever reason, the apparatus is incomplete. I'm working in Daniel, and I had to look at the Leiden apparatus for that book elsewhere. The books present are: Pentateuch, Kings, Chronicles, Song of Songs, Isaiah, 12 Prophets, 4 Maccabees. No Joshua, Judges or Samuel; most of the Writings are missing, and the Apocrypha are all but non-existent. Be careful what you want access to when buying this, because chances are you're better off just asking a colleague or librarian.

Typos are a little more frequent than I'd like, and the fact that you can get the Greek text and a translation in the Perseus Classics Collection for free (https://www.logos.com/product/9940/perseus-classics-collection) makes me think this is mostly a waste of money. Functional as a text, though.