I tried to do a search of the forum for more information on any of the Bristol resource sets being offered .. to no avail.
Doe anyone have information? Translation? Benefit? Etc.?
Don't know anything about them, but they say they are published by Bristol Classical Press, so I did a google search for that. Found this blurb about it: "Bristol Classical Press now comprises all titles that were previously published by Duckworth Academic, following its acquistion by Bloomsbury Academic in 2010. Duckworth Academic's list has long been known for its strong publishing centered on books about the ancient world, and Bristol Classical Press will continue this tradition."
The product description pages say who the editors of each volume are, and give brief bios of these people. It looks like these are not translations but are in the original languages, except for the secondary literature published in English about the original works, which are included in these collections. It's pretty clear from the product descriptions which ones are authored by someone else besides the classical author, and are thus secondary literature in English.
The Bristol collections contain up-to-date original-language texts along with extensive notes, commentary, introductions, summaries, maps, biographical and background material, etc. Bristol (owned by Bloomsbury Academic) has a reputation for offering some of the highest quality scholarship in the classical studies market.
I hope this helps. Let me know if you have further questions.